Chemical kinetics can predict the __________ of a chemical reaction.
Chemical kinetics can predict the __________ of a chemical reaction.
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is
The rate constant of a chemical reaction increases by 100 times when the temperature is increased from 400 °K to 500 °K. Assuming transition state theory is valid, the value of E/R is
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from
The value of steric factor 'P' in the equation k = PZeE/RT usually ranges from
An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.
An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.
A batch reactor is suitable for
A batch reactor is suitable for
If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.
If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.
Limiting reactant in a chemical reaction decides the
Limiting reactant in a chemical reaction decides the
A reactor is generally termed as an autoclave, when it is a
A reactor is generally termed as an autoclave, when it is a
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?
Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?
A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),
CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)
CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)
Then K₁, K₂ and K3 are related as:
At a given temperature, K₁, K₂ and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively.
CH₄(g) + H₂O(g) ⇋ CO(g) + 3H₂(g),
CO(g) + H₂O(g) ⇋ CO₂(g) + H₂(g)
CH₄(g) + 2H₂O(g) ⇋ CO₂(g) + 4H₂(g)
Then K₁, K₂ and K3 are related as:
In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO₂ to air.
In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ __________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO₂ to air.
A back mix reactor is
A back mix reactor is
The catalytic activity of enzymes is due to their capacity to lower the __________ energy.
The catalytic activity of enzymes is due to their capacity to lower the __________ energy.
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is
Which of the following chemical reactions will be favoured by low pressure ?
Which of the following chemical reactions will be favoured by low pressure ?
Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b
Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)
A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)
For an ideal plug flow reactor, the value of Peclet number is
For an ideal plug flow reactor, the value of Peclet number is
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
For the same residence time, which one will give the maximum conversion?
For the same residence time, which one will give the maximum conversion?
Which of the following will give maximum gas conversion?
Which of the following will give maximum gas conversion?
Higher free energy of activation of a chemical reaction (at a given temperature) implies
Higher free energy of activation of a chemical reaction (at a given temperature) implies
An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the
An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m³ .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the
The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be
The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.
When all the limiting reactant is consumed in the reaction, the operational yield __________ the relative yield.
For multiple reactions, the flow pattern within the vessel affects the
For multiple reactions, the flow pattern within the vessel affects the
Conversion increases with increase in temperature in case of a an __________ reaction.
Conversion increases with increase in temperature in case of a an __________ reaction.
Which of the following is not a unit of reaction rate?
Which of the following is not a unit of reaction rate?
There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
In an exothermic chemical reaction, the reactants compared to the products have
In an exothermic chemical reaction, the reactants compared to the products have
In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.
In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.
If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is
If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is
Mean residence time is equal to the space time, when
Mean residence time is equal to the space time, when
A photochemical reaction is __________ light.
A photochemical reaction is __________ light.
The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)
In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants)
For a fluidised bed reactor, the most suitable/relevant model is a __________ model.
For a fluidised bed reactor, the most suitable/relevant model is a __________ model.
The eddy diffusivity for a liquid in plug flow must be
The eddy diffusivity for a liquid in plug flow must be
B.E.T. method can be used to determine the __________ of a porous catalyst.
B.E.T. method can be used to determine the __________ of a porous catalyst.
Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.
Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in __________ in conversion.
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
Bulk diffusion in catalyst pore __________ with increase in pressure.
Bulk diffusion in catalyst pore __________ with increase in pressure.
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is
The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is
The rate constant of a first order reaction depends on the
The rate constant of a first order reaction depends on the
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
In solid catalysed reactions the diffusional effects are more likely to affect the overall rate of reaction for
If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)
If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)
Study of chemical kinetics is the easiest in the case of __________ reactions.
Study of chemical kinetics is the easiest in the case of __________ reactions.
Threshold energy in a reaction is equal to the
Threshold energy in a reaction is equal to the
For all positive reaction orders for a particular duty,
For all positive reaction orders for a particular duty,
What is the dispersion number for a CSTR?
What is the dispersion number for a CSTR?
The catalyst in a second order reversible reaction increases the rate of the forward reaction
The catalyst in a second order reversible reaction increases the rate of the forward reaction
Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?
Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?
A typical example of an exothermic reversible reaction conducted at high pressure in industry is
A typical example of an exothermic reversible reaction conducted at high pressure in industry is
The energy balance equation over a tubular reactor under transient conditions is
The energy balance equation over a tubular reactor under transient conditions is
A trickle bed reactor is the one, which
A trickle bed reactor is the one, which
The temperature dependence of reaction rate constant (K) by Arhenius law is given by
The temperature dependence of reaction rate constant (K) by Arhenius law is given by
A first order reaction requires two equal sized CSTR. The conversion is
A first order reaction requires two equal sized CSTR. The conversion is
If the rate of a chemical reaction becomes slower at a given temperature, then the
If the rate of a chemical reaction becomes slower at a given temperature, then the
A space time of 3 hours for a flow reactor means that
A space time of 3 hours for a flow reactor means that
For a zero order reaction, the concentration of product increases with the
For a zero order reaction, the concentration of product increases with the
What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on?
What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on?
Helium-mercury method can be used to determine the __________ of the catalyst particle.
Helium-mercury method can be used to determine the __________ of the catalyst particle.
The equilibrium constant K of a chemical reaction depends on
The equilibrium constant K of a chemical reaction depends on
For the reaction, A + B → 2B + C,
For the reaction, A + B → 2B + C,
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.
The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.
The catalyst in a first order chemical reaction changes the
The catalyst in a first order chemical reaction changes the
The rate at which a chemical substance reacts is proportional to its
The rate at which a chemical substance reacts is proportional to its
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.
If a solid-gas non-catalytic reaction occurs at very high temperature, the rate controlling step is the __________ diffusion.
An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will
An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will
The half life period of a first order reaction is given by (where, K = rate constant. )
The half life period of a first order reaction is given by (where, K = rate constant. )
For a mixed flow reactor operating at steady state, the rate of reaction is given by
For a mixed flow reactor operating at steady state, the rate of reaction is given by
In an ideal tubular-flow reactor
In an ideal tubular-flow reactor
A batch reactor is
A batch reactor is
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is
Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants ; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is
Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( - rA) = k.CA.CB
Find a mechanism that is consistent with the rate equation and reaction given below: 2A + B → A₂B, ( - rA) = k.CA.CB
The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
The reaction A → B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
A space velocity of 5 hr⁻¹ means that
A space velocity of 5 hr⁻¹ means that
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is
A stirred tank reactor compared to tubular-flow reactor provides
A stirred tank reactor compared to tubular-flow reactor provides
According to the 'law of mass action', the rate of reaction is directly proportional to the
According to the 'law of mass action', the rate of reaction is directly proportional to the
Organic catalysts differ from the inorganic catalyst in the sense that the former is
Organic catalysts differ from the inorganic catalyst in the sense that the former is
Catalyst is a substance, which __________ chemical reaction.
Catalyst is a substance, which __________ chemical reaction.
From among the following, choose one which is not an exothermic process.
From among the following, choose one which is not an exothermic process.
A catalyst promoter
A catalyst promoter
With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will
With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will
What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?
What is the value of 'n' if the reaction rate of the chemical reaction A → B, is proportional to CAn and it is found that the reaction rate triples, when the concentration of 'A' is increased 9 times ?
For a tubular flow reactor with uniform concentration and temperature, the independent variable is
For a tubular flow reactor with uniform concentration and temperature, the independent variable is
An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.
An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will __________ with decrease in space time.
If 'n' is the order of reaction, then unit of rate constant is
If 'n' is the order of reaction, then unit of rate constant is
In an ideal P.F.R. at steady state conditions
In an ideal P.F.R. at steady state conditions
The equilibrium constant of chemical reaction __________ in the presence of catalyst.
The equilibrium constant of chemical reaction __________ in the presence of catalyst.
The rate at which a chemical substance reacts is proportional to its
The rate at which a chemical substance reacts is proportional to its
The rate constant of a reaction is a function of the
The rate constant of a reaction is a function of the
The most suitable reactor for carrying out an auto-thermal reaction is a
The most suitable reactor for carrying out an auto-thermal reaction is a
For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by
For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by
