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
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
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.
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
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.
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 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
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.
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
What is the dispersion number for a plug flow reactor?
What is the dispersion number for a plug flow reactor?
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.
Backmixing is most predominant in
Backmixing is most predominant in
The rate constant of a chemical reaction decreases by decreasing the
The rate constant of a chemical reaction decreases by decreasing the
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
Inversion of cane sugar is an example of
Inversion of cane sugar is an example of
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?
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
Vegetable oils are hydrogenated in a __________ reactor.
Vegetable oils are hydrogenated in a __________ 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.
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.
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.
A catalyst is said to be a negative catalyst, ifit
A catalyst is said to be a negative catalyst, ifit
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.
reactant and product streams). The amount of heat to be removed is
reactant and product streams). The amount of heat to be removed is
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
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
In case of staged packed bed reactors carrying out exothermic reaction, use
In case of staged packed bed reactors carrying out exothermic reaction, use
Transition state theory gives the rate constant as
Transition state theory gives the rate constant as
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
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)
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.
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
Radioactive decay follows __________ order kinetics.
Radioactive decay follows __________ order kinetics.
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.
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
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 ?
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.
The irreversible reaction is a special case of reversible reaction, if the
The irreversible reaction is a special case of reversible reaction, if the
Pick out the correct statement
Pick out the correct statement
The energy of activation of a chemical reaction
The energy of activation of a chemical reaction
Pick out the wrong statement.
Pick out the wrong statement.
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.
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.
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 vessel dispersion number (D/μL) for plug flow is
The vessel dispersion number (D/μL) for plug flow is
Pick out the wrong statement.
Pick out the wrong statement.
The reactions of high molecularity are rare, because
The reactions of high molecularity are rare, because
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)
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
Collision theory gives the rate constant for bimolecular reaction as
Collision theory gives the rate constant for bimolecular reaction as
Specific rate constant for a second order reaction
Specific rate constant for a second order reaction
Pick out the correct statement.
Pick out the correct statement.
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?
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.
A multiple reaction may be classified as a __________ reaction.
A multiple reaction may be classified as a __________ reaction.
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?
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 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 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.
Pick out the wrong statement
Pick out the wrong statement
Pick out the wrong statement.
Pick out the wrong statement.
In Langmuir treatment of adsorption,
In Langmuir treatment of adsorption,
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?
Molecularity of a reaction
Molecularity of a reaction
Enzymes are destroyed, when the
Enzymes are destroyed, when the
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
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 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?
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
__________ explains the mechanism of catalysis.
__________ explains the mechanism of catalysis.
In a/an __________ vessel, the fluid enters and leaves following plug flow.
In a/an __________ vessel, the fluid enters and leaves following plug flow.
For a zero order chemical reaction, the
For a zero order chemical reaction, the
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
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
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
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.
The percent conversion of ethanol in the reactor is
The percent conversion of ethanol in the reactor 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
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?
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
Most important characteristics of gas-liquid reactors are the
Most important characteristics of gas-liquid reactors are the
Pick out the correct statement.
Pick out the correct statement.
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.
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?
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?
A catalyst loses its activity due to
A catalyst loses its activity due to
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 rate constant of a chemical reaction increases by increasing the
The rate constant of a chemical reaction increases by increasing the
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
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?
__________ resistance is not involved in the combustion of a carbon particle.
__________ resistance is not involved in the combustion of a carbon particle.
Knudsen diffusion is directly proportional to
Knudsen diffusion is directly proportional to
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.
Velocity of a reaction depends upon the
Velocity of a reaction depends upon the
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
A plug-flow reactor is characterised by
A plug-flow reactor is characterised by
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
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?
The reaction between oxygen and organic material is a/an __________ reaction.
The reaction between oxygen and organic material is a/an __________ reaction.
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.
