A catalyst promoter
A catalyst promoter
Rate of a chemical reaction is not influenced by the
Rate of a chemical reaction is not influenced by the
A stirred tank reactor compared to tubular-flow reactor provides
A stirred tank reactor compared to tubular-flow reactor provides
The use of space time is preferred over the mean residence time in the design of a/an
The use of space time is preferred over the mean residence time in the design of a/an
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
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
A batch reactor is
A batch reactor is
For multiple reactions, the flow pattern within the vessel affects the
For multiple reactions, the flow pattern within the vessel affects the
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
A space velocity of 5 hr⁻¹ means that
A space velocity of 5 hr⁻¹ means that
A back mix reactor is
A back mix reactor is
In a continuous flow stirred tank reactor, the composition of the exit stream
In a continuous flow stirred tank reactor, the composition of the exit stream
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 rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions.
For reaction, P + 2 → 3R, molar rate of consumption of P is
For reaction, P + 2 → 3R, molar rate of consumption of P is
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.
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
Effectiveness factor (E) of a catalyst pellet is defined as, E = (actual rate within pore of catalyst/rate if notsnowed by pore diffusion) Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus)
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when
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?
In an ideal P.F.R. at steady state conditions
In an ideal P.F.R. at steady state conditions
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
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.
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇋ 2NH₃.
Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇋ 2NH₃.
Catalyst carriers
Catalyst carriers
When a catalyst increases the rate of chemical reaction, the rate constant
When a catalyst increases the rate of chemical reaction, the rate constant
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
Chemical kinetics can predict the __________ of a chemical reaction.
Chemical kinetics can predict the __________ of a chemical reaction.
Oil is hydrogenated using nickel catalyst in a __________ reactor.
Oil is hydrogenated using nickel catalyst in a __________ reactor.
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
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
Photochemical reaction rate does not depend significantly on temperature, because
Photochemical reaction rate does not depend significantly on temperature, because
When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as
When the reaction is dominated by in-traparticle diffusion, the apparent order of reaction (nD) as measured is related to the true order (n) as
The rate at which a chemical substance reacts is proportional to its
The rate at which a chemical substance reacts is proportional to its
Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.
Half life period of a chemical reaction is proportional to CA0-1 , if the reaction is of __________ order.
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.
The energy balance equation over a tubular reactor under transient conditions is
The energy balance equation over a tubular reactor under transient conditions is
For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.
For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a __________ reactor.
The rate at which a chemical substance reacts is proportional to its
The rate at which a chemical substance reacts is proportional to its
A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.
A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.
A photochemical reaction is __________ light.
A photochemical reaction is __________ light.
Pick out the wrong statement pertaining to space velocity of flow reactors.
Pick out the wrong statement pertaining to space velocity of flow reactors.
A high space velocity means that a given
A high space velocity means that a given
Which of the following is the most suitable for isothermal operation?
Which of the following is the most suitable for isothermal operation?
In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the
In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the
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
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
A backmix reactor
A backmix reactor
Pick out the correct statement.
Pick out the correct statement.
A photochemical reaction is
A photochemical reaction is
The concentration of A in a first order reaction, A → B, decreases
The concentration of A in a first order reaction, A → B, decreases
For the reaction, A + B → 2B + C,
For the reaction, A + B → 2B + C,
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)
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
Exothermic reactions are best carried out in
Exothermic reactions are best carried out in
A first order reaction requires two equal sized CSTR. The conversion is
A first order reaction requires two equal sized CSTR. The conversion is
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
In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
Bulk diffusion in catalyst pore __________ with increase in pressure.
Bulk diffusion in catalyst pore __________ with increase in pressure.
Exposure of a photographic plate to produce a latent image is an example of __________ reaction.
Exposure of a photographic plate to produce a latent image is an example of __________ reaction.
A rise in temperature
A rise in temperature
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.
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
Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
Carbon particles accummulated on the catalyst used in the gas oil cracking lies in the category of __________ poison.
Sulphuric acid is used as a catalyst in the
Sulphuric acid is used as a catalyst in the
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
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst
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
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?
For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min⁻¹ . What will be the conversion for a PFR with a space velocity of 0.2 min⁻¹? Assume that all the other operating conditions are the same for CSTR and PFR.
For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min⁻¹ . What will be the conversion for a PFR with a space velocity of 0.2 min⁻¹? Assume that all the other operating conditions are the same for CSTR and PFR.
For an ideal plug flow reactor, the value of Peclet number is
For an ideal plug flow reactor, the value of Peclet number is
With increase in temperature, the rate constant obeying Arhenious equation
With increase in temperature, the rate constant obeying Arhenious equation
For a __________ order reaction, the units of rate constant and rate of reaction are the same.
For a __________ order reaction, the units of rate constant and rate of reaction are the same.
A catalyst in a chemical reaction
A catalyst in a chemical reaction
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.
The half life period of a first order reaction is
The half life period of a first order reaction is
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is
In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is
A catalyst inhibitor
A catalyst inhibitor
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to
A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to
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?
With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.
With increase in temperature, the equilibrium __________ rises in case of endothermic reaction.
The rate constant of a reaction is a function of the
The rate constant of a reaction is a function of the
Slurry reactors are characterised by the
Slurry reactors are characterised by the
The rate of reaction of a/an __________ reaction is not affected by temperature rise.
The rate of reaction of a/an __________ reaction is not affected by temperature rise.
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
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.
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.
BET apparatus
BET apparatus
A batch reactor is characterised by
A batch reactor is characterised by
An autothermal reactor is
An autothermal reactor is
The equilibrium constant K of a chemical reaction depends on
The equilibrium constant K of a chemical reaction depends on
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 first order chemical reaction, the rate constant
For a first order chemical reaction, the rate constant
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is
The unit of frequency factor in Arhenious equation is
The unit of frequency factor in Arhenious equation is
Thermodynamic equilibrium constant in a system is affected by
Thermodynamic equilibrium constant in a system is affected by
Molecularity of an elementary reaction, P + Q → R + S is
Molecularity of an elementary reaction, P + Q → R + S is
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
