"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."
"A spherical porous catalyst particle of radius R is subjected to reactant A which reacts to form B by a zero order surface reaction A → B. Film mass transfer resistance is negligible and pore diffusion of A is rate controlling. The effectiveness factor of the catalyst is reported as 7/8. Which of the following statement is true?A. Inner catalyst core of radius R/8 does not participate in reaction."
Which of the following is not endothermic in nature?
Which of the following is not endothermic in nature?
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A → B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
When an exothermic reversible reaction is conducted adiabatically, the rate of reaction
When an exothermic reversible reaction is conducted adiabatically, the rate of reaction
When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only __________ the true value.
Pick out the wrong statement.
Pick out the wrong statement.
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is ____________ (ii)
In the fluid catalytic cracker (FCC), the cracking reaction is __________ (i) and the regeneration is ____________ (ii)
Non-catalytic fluid-solid reactions are represented by __________ model.
Non-catalytic fluid-solid reactions are represented by __________ model.
For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.
For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases __________ times.
Design of heterogeous catalytic reactor involves consideration of __________ steps.
Design of heterogeous catalytic reactor involves consideration of __________ steps.
On application of pressure to the equilibrium system, ice ⇋ water; which of the following phenomenon will occur?
On application of pressure to the equilibrium system, ice ⇋ water; which of the following phenomenon will occur?
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
A reaction which is catalysed by a base is catalysed by all substances which have a tendency to
The order of a chemical reaction is
The order of a chemical reaction is
Pick out the correct statement.
Pick out the correct statement.
Inversion of cane sugar is an example of
Inversion of cane sugar is an example of
The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.
The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.
Space time equals the mean residence time
Space time equals the mean residence time
Velocity of a reaction depends upon the
Velocity of a reaction depends upon the
B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.
B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm.
In a CSTR __________ varies with time.
In a CSTR __________ varies with time.
Half life period of a first order irreversible reaction A → B is
Half life period of a first order irreversible reaction A → B is
Most important characteristics of gas-liquid reactors are the
Most important characteristics of gas-liquid reactors are the
Vegetable oils are hydrogenated in a __________ reactor.
Vegetable oils are hydrogenated in a __________ reactor.
The heat of reaction
The heat of reaction
Pick out the wrong statement
Pick out the wrong statement
Backmixing is most predominant in
Backmixing is most predominant in
__________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.
__________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.
In case of a P.F.R., there
In case of a P.F.R., there
Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?
With increase in initial concentration, the fractional conversion of a first order reaction in a given time
With increase in initial concentration, the fractional conversion of a first order reaction in a given time
Pick out the wrong statement.
Pick out the wrong statement.
Kinetics of a catalytic reaction can be best studied on a/an __________ reactor.
Kinetics of a catalytic reaction can be best studied on a/an __________ reactor.
Pick out the wrong statement.
Pick out the wrong statement.
For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume
n' number of plug flow reactors (P.F.R) in series with a total volume 'V' gives the same conversion as one P.F.R. of volume
Fluidised bed reactor is characterised by
Fluidised bed reactor is characterised by
The energy of activation of a chemical reaction
The energy of activation of a chemical reaction
For the liquid phase parallel reactions:
R, rR = K?.CA2; E? = 80 KJ/mole
S, rS = K?.CA ; E? = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
For the liquid phase parallel reactions:
R, rR = K?.CA2; E? = 80 KJ/mole
S, rS = K?.CA ; E? = 120 KJ/mole
The desired product is R. A higher selectivity of R will be achieved, if the reaction is conducted at
Which of the following is a characteristic of an ideal plug flow reactor?
Which of the following is a characteristic of an ideal plug flow reactor?
The role of a catalyst in a chemical reaction is to change the
The role of a catalyst in a chemical reaction is to change the
The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.
The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.
Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as
Rate constant 'k' and absolute temperature 'T' are related by collision theory (for bimolecular) as
Shift conversion reaction
Shift conversion reaction
Photo-chemical reactions occur in presence of
Photo-chemical reactions occur in presence of
The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times.
The rate of a gas phase reaction is given by K . CA . CB. If the volume of the reaction vessel is reduced to l/4th of its initial volume, then the reaction rate compared to the original rate will be __________ times.
BET apparatus is used to determine the
BET apparatus is used to determine the
Which of the following will favour the reverse reaction in a chemical equilibrium reaction?
Which of the following will favour the reverse reaction in a chemical equilibrium reaction?
In an exothermic reaction, the energy of the reacting substances as compared to that of products is
In an exothermic reaction, the energy of the reacting substances as compared to that of products is
In a zero order reaction, reactants concentration does not change with time and the
In a zero order reaction, reactants concentration does not change with time and the
Fluid flow in a real packed bed can be approximated as __________ model.
Fluid flow in a real packed bed can be approximated as __________ model.
In the hydrodealkylation of toluene to benzene, the following reactions occur:
C₇H₈ + H₂ → C₆H₆ + CH₄
2C₆H₆ ⇋ C₁₂H₁₀ + H₂
Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
In the hydrodealkylation of toluene to benzene, the following reactions occur:
C₇H₈ + H₂ → C₆H₆ + CH₄
2C₆H₆ ⇋ C₁₂H₁₀ + H₂
Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
In a semi-batch reactor
In a semi-batch reactor
Which of the following factors control the design of a fluid-solid reactor?
Which of the following factors control the design of a fluid-solid reactor?
The percent conversion of ethanol in the reactor is
The percent conversion of ethanol in the reactor is
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is
The enzyme which can catalyse the conversion of glucose to ethyl alcohol is
If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
Velocity of a chemical reaction
Velocity of a chemical reaction
Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.
Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.
In an ideal mixed reactor (at steady state), the
In an ideal mixed reactor (at steady state), the
Rate of an autocatalytic chemical reaction is a function of
Rate of an autocatalytic chemical reaction is a function of
To maximise the formation of R in the simultaneous reaction
A + B → R , rR = 2CA0.5.CB2
A + B → S , rS = 1.5 CA . CB
We should have
To maximise the formation of R in the simultaneous reaction
A + B → R , rR = 2CA0.5.CB2
A + B → S , rS = 1.5 CA . CB
We should have
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
Molecularity of a reaction
Molecularity of a reaction
Rate of a chemical reaction is not affected by the
Rate of a chemical reaction is not affected by the
As the chemical reaction proceeds, the rate of reaction
As the chemical reaction proceeds, the rate of reaction
The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
Space time in flow reactor is
Space time in flow reactor is
N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.
N' plug flow reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for __________ order reactions.
In which of the following reactions, thee-quilibrium will shift to the right, if the total pressure is increased?
In which of the following reactions, thee-quilibrium will shift to the right, if the total pressure is increased?
With decrease in temperature, the equilibrium conversion of a reversible endother- mic reaction
With decrease in temperature, the equilibrium conversion of a reversible endother- mic reaction
For a homogeneous reaction of nth order, the dimension of the rate constant is given by
For a homogeneous reaction of nth order, the dimension of the rate constant is given by
Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
Kinetics of a solid catalysed reaction can best be studied in a __________ reactor.
Radioactive decay follows __________ order kinetics.
Radioactive decay follows __________ order kinetics.
In Langmuir treatment of adsorption,
In Langmuir treatment of adsorption,
Transition state theory relates the above quantities as
Transition state theory relates the above quantities as
Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the
Catalytic action in a catalytic chemical reaction follows from the ability of catalyst to change the
The performance of a cascade of CSTR's can be improved by adding
The performance of a cascade of CSTR's can be improved by adding
A catalyst in a chemical reaction __________ free energy change in the reaction.
A catalyst in a chemical reaction __________ free energy change in the reaction.
An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is
An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?
Which of the following is an independent variable for a batch tank reactor with uniform concentration and temperature?
At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?
At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?
The excess energy of the reactants required to dissociate into products is known as the __________ energy.
The excess energy of the reactants required to dissociate into products is known as the __________ energy.
A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be
A pulse tracer is introduced in an ideal CSTR (with a mean residence time ι) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be
For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is
For identical flow rate, feed composition and for elementary first order reactions, 'N' equal sized mixed reactors in series with a total volume 'V' gives the same conversion as a single plug flow reactor of volume 'V' for constant density systems. This is true, when the value of 'N' is
Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
Which of the following is not a theory of homogeneous reaction?
Which of the following is not a theory of homogeneous reaction?
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?
In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffacted by pressure changes ?
The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.
The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.
Pick out the wrong statement.
Pick out the wrong statement.
The importance of diffusion in a catalyst are increased by
The importance of diffusion in a catalyst are increased by
The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between
The catalytic converter for conversion of SO₂ to SO₃ by contact process should have a feed with SO₂ content between
With increase in temperature, the equilibrium conversion of a reversible exothermic reaction
With increase in temperature, the equilibrium conversion of a reversible exothermic reaction
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the
Pick out the correct statement
Pick out the correct statement
The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.
The decomposition of A into B is represented by the exothermic reaction, A ⇋ 2B. To achieve maximum decomposition, it is desirable to carry out the reaction.
The reaction between oxygen and organic material is a/an __________ reaction.
The reaction between oxygen and organic material is a/an __________ reaction.
Pick out the wrong statement:
Pick out the wrong statement:
The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be
The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.
For series reaction, the relative yield
For series reaction, the relative yield
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.
Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ⇋ CaO + CO₂), the pressure of CO₂ increases, if
Considering the endotheomic dissociation of CaCO₃ in a closed vessel (CaCO₃ ⇋ CaO + CO₂), the pressure of CO₂ increases, if
In case of staged packed bed reactors carrying out exothermic reaction, use
In case of staged packed bed reactors carrying out exothermic reaction, use
For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is
For the gaseous reaction 2A → B, where the feed consists of 50 mole % A and 50 mole % inerts, the expansion factor is
Participation of __________ is involved in the occurrence of a chemical reaction.
Participation of __________ is involved in the occurrence of a chemical reaction.
The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is
In a semi-batch reactor,
In a semi-batch reactor,
__________ is the response curve for a step input signal from a reactor.
__________ is the response curve for a step input signal from a reactor.
The rate constant of a chemical reaction increases by increasing the
The rate constant of a chemical reaction increases by increasing the
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is
The reactions with low activation energy are
The reactions with low activation energy are
The reactions of high molecularity are rare, because
The reactions of high molecularity are rare, because
The extent of a reaction is
The extent of a reaction is
Signal normally used to study non-ideal flow by stimulus response technique is __________ input.
Signal normally used to study non-ideal flow by stimulus response technique is __________ input.
Transition state theory gives the rate constant as
Transition state theory gives the rate constant as
For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to
'Unreacted core model' represents the reaction involving
'Unreacted core model' represents the reaction involving
The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt
The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt
Sometimes, batch process is preferred over continuous process, when the product
Sometimes, batch process is preferred over continuous process, when the product
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is
In a/an __________ vessel, the fluid enters and leaves following plug flow.
In a/an __________ vessel, the fluid enters and leaves following plug flow.
Which of the following is an autocatalytic reaction?
Which of the following is an autocatalytic reaction?
If in the gaseous phase reaction, N₂O₄ ⇋ 2NO₂, x is the part of N₂O₄ which dissociates, then the number of molecules at equilibrium will be
If in the gaseous phase reaction, N₂O₄ ⇋ 2NO₂, x is the part of N₂O₄ which dissociates, then the number of molecules at equilibrium will be
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is
For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cxn, then what is the value of 'n' ?
For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to Cxn, then what is the value of 'n' ?
The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)
The effectiveness factor for large value of Thiele modulus (L√(K/D1)) of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm²/second)
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.
The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of __________ order.
For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.
Carrier in a catalyst increases its
Carrier in a catalyst increases its
Which of the following is the most suitable for very high pressure gas phase reaction?
Which of the following is the most suitable for very high pressure gas phase reaction?
Half life period of a chemical reaction is
Half life period of a chemical reaction is
A plug-flow reactor is characterised by
A plug-flow reactor is characterised by
During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the
During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en- dothermic reaction. The yield of SO₃ will be maximised, if the
Differential method for analysing the kinetic data is used
Differential method for analysing the kinetic data is used
Pick out the wrong statement.
Pick out the wrong statement.
What is the dispersion number for a plug flow reactor?
What is the dispersion number for a plug flow reactor?
The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reaction with low activation energy are
The minimum energy required to allow a chemical reaction to proceed is termed as the 'threshold energy '. Chemical reaction with low activation energy are
A multiple reaction may be classified as a __________ reaction.
A multiple reaction may be classified as a __________ reaction.
In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.
In a/an __________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation.
The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the
The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇋ Y, in which the
The dispersion number of perfect mixed flow is
The dispersion number of perfect mixed flow is
A catalyst loses its activity due to
A catalyst loses its activity due to
In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?
In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?
When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
From Arhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is
From Arhenius law, a plot of loge K versus 1/T gives a straight line with a slope of (-E/R). The unit of E/R is
Pick out the correct statement.
Pick out the correct statement.
An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m³ of each A and B enters the reactor at 8m³ /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?
(Data: Heat of reaction = - 50 kJ/mole, Density of the reacting mixture = 1000kg/m³, Specific heat of reacting mixture = 2kJ/kg.K)
The above data can be assumed to be independent of temperature and composition.
An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m³ of each A and B enters the reactor at 8m³ /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?
(Data: Heat of reaction = - 50 kJ/mole, Density of the reacting mixture = 1000kg/m³, Specific heat of reacting mixture = 2kJ/kg.K)
The above data can be assumed to be independent of temperature and composition.
Chemical reaction rate of a component depends upon the
Chemical reaction rate of a component depends upon the
Pick out the wrong statement.
Pick out the wrong statement.
The performance equations for constant density systems are identical for
The performance equations for constant density systems are identical for
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
Promoter is added to the catalyst to improve its
Promoter is added to the catalyst to improve its
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
__________ resistance is not involved in the combustion of a carbon particle.
__________ resistance is not involved in the combustion of a carbon particle.
Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because
Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because
Integral method for analysing the kinetic data is used
Integral method for analysing the kinetic data is used
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of
Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.
The space time is equivalent to the holding time in a steady state mixed reactor for
The space time is equivalent to the holding time in a steady state mixed reactor for
With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be
With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be
Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?
Autocatalytic reactions are best carried out in a
Autocatalytic reactions are best carried out in a
In a reversible reaction, a catalyst increases the rate of forward reaction
In a reversible reaction, a catalyst increases the rate of forward reaction
Batch process is preferred over continuous process, when the
Batch process is preferred over continuous process, when the
The increase in the rate of reaction with temperature is due to
The increase in the rate of reaction with temperature is due to
Pick out the wrong statement.
Pick out the wrong statement.
The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
The reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to
If the pore diffusion controls in a catalytic reaction, the apparent activation energy Ea is equal to
Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an __________ reaction.
Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an __________ reaction.
If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to
The irreversible reaction is a special case of reversible reaction, if the
The irreversible reaction is a special case of reversible reaction, if the
The single parameter model proposed for describing non-ideal flow is the __________ model.
The single parameter model proposed for describing non-ideal flow is the __________ model.
The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y ⇋ 3X+2Y indicates that
The effect of increasing pressure on the gaseous equilibrium of the reaction 2X+3Y ⇋ 3X+2Y indicates that
Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.
Equilibrium of a chemical reaction as viewed by kinetics is a __________ state.
The rate constant of a reaction depends on the
The rate constant of a reaction depends on the
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the __________ energy.
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a
Ionic reactions occur in
Ionic reactions occur in
The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to
The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a 'tanks in series model' comprising of 'm' tanks is equal to
A balanced chemical reaction equation conforms to the law of
A balanced chemical reaction equation conforms to the law of
The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.
The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase __________ times, if the temperature rises form 10 to 100°C.
When a catalyst increases the rate of forward reaction, the value of rate constant
When a catalyst increases the rate of forward reaction, the value of rate constant
Knudsen diffusion is directly proportional to
Knudsen diffusion is directly proportional to
The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is
The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is
The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?
The conversion XA and residence time data are collected for zero order liquid phase reaction in a stirred tank reactor. Which of the following will be a straight line?
The sequence in which three CSTR's of volumes 5, 10 and 15 m³ will be connected in series to obtain the maximum production in a second order irreversible reaction is
The sequence in which three CSTR's of volumes 5, 10 and 15 m³ will be connected in series to obtain the maximum production in a second order irreversible reaction is
For a zero order chemical reaction, the
For a zero order chemical reaction, the
The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are
The molecularity and the order of reaction respectively, for the hydrolysis of methyl acetate in presence of acids are
The vessel dispersion number (D/μL) for plug flow is
The vessel dispersion number (D/μL) for plug flow is
In case of a/an __________ chemical reaction, conversion increases with the rise in temperature.
In case of a/an __________ chemical reaction, conversion increases with the rise in temperature.
Reactions with high activation energy are
Reactions with high activation energy are
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
A reaction in which one of the products of reaction acts as a catalyst is called a/an __________ reaction.
For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
A catalyst is said to be a negative catalyst, ifit
A catalyst is said to be a negative catalyst, ifit
Pick out the wrong statement.
Pick out the wrong statement.
The units of frequency factor in Arhenious equation
The units of frequency factor in Arhenious equation
Which of the following is a controlling factor in very fast heterogeneous reaction?
Which of the following is a controlling factor in very fast heterogeneous reaction?
In a chemical reaction, __________ are conserved.
In a chemical reaction, __________ are conserved.
For any reaction, we may write conversion as a function of
For any reaction, we may write conversion as a function of
In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.
In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.
Half-life period for a first order reaction is __________ the initial concentration of the reactant.
Half-life period for a first order reaction is __________ the initial concentration of the reactant.
__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.
Which of the following factors control the deactivation of a porous catalyst pellet?
Which of the following factors control the deactivation of a porous catalyst pellet?
For a heterogeneous catalytic reaction
For a heterogeneous catalytic reaction
The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called
The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
The rate of a homogeneous reaction is a function of
The rate of a homogeneous reaction is a function of
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)
With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)
In flow reactors, the performance equations interrelate the rate of reaction to the
In flow reactors, the performance equations interrelate the rate of reaction to the
Reverse reaction in a chemical equilibrium is favoured by the
Reverse reaction in a chemical equilibrium is favoured by the
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
For the reversible reaction A ⇋ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?
For the reversible reaction A ⇋ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium?
A batch reactor suffers from following disadvantage.
A batch reactor suffers from following disadvantage.
The residence time distribution of an ideal CSTR is
The residence time distribution of an ideal CSTR is
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following does not produce a change in the value of rate constant of a reaction?
Which of the following does not produce a change in the value of rate constant of a reaction?
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
Specific rate constant for a second order reaction
Specific rate constant for a second order reaction
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO₂ and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?
6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO₂ and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant?
Pick out the correct statement.
Pick out the correct statement.
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of
The following gas phase reactions are carried out isothermally in a CSTR.
A → 2R ; r₁ = K₁pA ;
K₁ = 20mole/(sec.m³ bar)
A → 3S ; r₂ = K₂ pA ;
K₂ = 40mole/ (sec.m³ .bar)
What is the maximum possible value of FR(mole/sec.) ?
The following gas phase reactions are carried out isothermally in a CSTR.
A → 2R ; r₁ = K₁pA ;
K₁ = 20mole/(sec.m³ bar)
A → 3S ; r₂ = K₂ pA ;
K₂ = 40mole/ (sec.m³ .bar)
What is the maximum possible value of FR(mole/sec.) ?
__________ explains the mechanism of catalysis.
__________ explains the mechanism of catalysis.
Reaction rate of a first order reaction, which is half completed in 23 minutes will be
Reaction rate of a first order reaction, which is half completed in 23 minutes will be
A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes.
A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes.
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?
For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cpn, then what is the value of 'n' for this chemical reaction
For the chemical reaction P → Q, it is found that the rate of reaction doubles as the concentration of 'P' is doubled. If the reaction rate is proportional to Cpn, then what is the value of 'n' for this chemical reaction
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
For a first order isothermal chemical reaction in a porous catalyst, the effectiveness factor is 0.3. The effectiveness factor will increase if the
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.
In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.
The gas phase reaction 2A ⇋ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is
The gas phase reaction 2A ⇋ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is
The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + Kr.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
Pick out the wrong statement.
Pick out the wrong statement.
For a first order reaction carried out in a plug flow reactor, the space time is
For a first order reaction carried out in a plug flow reactor, the space time is
According to Arhenious equation of temperature dependency of rate constant for an elementary reaction
According to Arhenious equation of temperature dependency of rate constant for an elementary reaction
Collision theory gives the rate constant for bimolecular reaction as
Collision theory gives the rate constant for bimolecular reaction as
Pick out the wrong statement.
Pick out the wrong statement.
For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is
The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
The exit age distribution curve E(t) for an ideal CSTR with the average residence time, τ, is given by
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.
Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes.
Which of the following is used for calcination of limestone and dolomite in industrial practice?
Which of the following is used for calcination of limestone and dolomite in industrial practice?
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.
In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.
Semibatch reactor is preferred, when a/an
Semibatch reactor is preferred, when a/an
Space velocity
Space velocity
Arhenious equation shows the variation of __________ with temperature.
Arhenious equation shows the variation of __________ with temperature.
Pick out the wrong statement.
Pick out the wrong statement.
Pick out the wrong statement.
Pick out the wrong statement.
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?
In autocatalytic reactions,
In autocatalytic reactions,
A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m³ ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min⁻¹ ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m³ CP = 4 J/gm.°C ; q = 10⁻³ m³/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will
In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will
What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction?
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single
For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single
The exit age distribution of fluid leaving a vessel is used to know the
The exit age distribution of fluid leaving a vessel is used to know the
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.
Pick out the correct statement.
Pick out the correct statement.
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
From collison theory, the reaction rate constant is proportional to
From collison theory, the reaction rate constant is proportional to
Enzymes are destroyed, when the
Enzymes are destroyed, when the
For an autocatalytic reactor, the suitable reactor set up is
For an autocatalytic reactor, the suitable reactor set up is
The rate constant of a chemical reaction decreases by decreasing the
The rate constant of a chemical reaction decreases by decreasing the
An example of autothermal reactor operation is
An example of autothermal reactor operation is
reactant and product streams). The amount of heat to be removed is
reactant and product streams). The amount of heat to be removed is
An imbalanced chemical reaction equation is against the law of
An imbalanced chemical reaction equation is against the law of
The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?
The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?
