1443 + Mcqs in Chemical Reaction Engineering Page 14 McqOptions

651.	Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.$?
A.	Highest possible
B.	Lowest possible
C.	Intermediate
D.	Room
Answer» B. Lowest possible

Discussion

652.	In flow reactors, the performance equations interrelate the rate of reaction to the$?
A.	Feed rate
B.	Reactor volume
C.	Extent of reaction
D.	All of the above
Answer» E.

Discussion

653.	The residence time distribution of an ideal CSTR is$?
A.	1/≈ì√ë exp (-t/≈ì√ë)
B.	≈í¬ß exp (-t/≈ì√ë)
C.	Exp(-t/≈ì√ë)
D.	1/≈ì√ë (-t/≈ì√ë)
Answer» D. 1/≈ì√ë (-t/≈ì√ë)

Discussion

654.	Which of the following is a controlling factor in very fast heterogeneous reaction?$?
A.	Heat and mass transfer effects
B.	Pressure
C.	Temperature
D.	Composition of reactant
Answer» B. Pressure

Discussion

655.	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?$?
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

656.	The exit age distribution curve E(t) for an ideal CSTR with the average residence time, ≈ì√ë, is given by$?
A.	E-t/≈ì√ë
B.	E-t/≈ì√ë/T
C.	1 - e-t/≈ì√ë
D.	1 - (e-t/≈ì√ë/T)
Answer» C. 1 - e-t/≈ì√ë

Discussion

657.	A batch adiabatic reactor at an initial temperature of 373¬¨‚àûK is being used for the reaction, A ‚Äö√ú√≠ B. Assume the heat of reaction is - 1kJ/mole at 373¬¨‚àûK 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.	5¬¨‚àûC
B.	10¬¨‚àûC
C.	20¬¨‚àûC
D.	100¬¨‚àûC
Answer» C. 20¬¨‚àûC

Discussion

658.	Knudsen diffusion is directly proportional to$?
A.	T
B.	‚Äö√ √∂T
C.	1/‚Äö√ √∂T
D.	T‚Äö√á√á
Answer» C. 1/‚Äö√ √∂T

Discussion

659.	Specific rate constant for a second order reaction$?
A.	Is independent of temperature
B.	Varies with temperature
C.	Depends on the nature of the reactants
D.	Both B and C
Answer» E.

Discussion

660.	A reaction which is catalysed by a base is catalysed by all substances which have a tendency to$?
A.	Lose a proton
B.	Gain a proton
C.	Gain an electron
D.	None of these
Answer» C. Gain an electron

Discussion

661.	Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.$?
A.	Increases
B.	Remains unchanged
C.	Decreases
D.	Unpredictable from the data
Answer» D. Unpredictable from the data

Discussion

662.	In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?$?
A.	N‚Äö√á√á + O‚Äö√á√á ‚Äö√°√£ 2NO
B.	PCl3 + Cl‚Äö√á√á ‚Äö√°√£ PCl5
C.	N + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â
D.	2SO‚Äö√á√á + O‚Äö√á√á ‚Äö√°√£ 2SO‚Äö√á√â
Answer» B. PCl3 + Cl‚Äö√á√á ‚Äö√°√£ PCl5

Discussion

663.	Promoter.$?
A.	Initiates a chemical reaction and is a catalyst by itself
B.	Atlers the position of equilibrium in a reversible reaction
C.	Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals
D.	All of the above
Answer» D. All of the above

Discussion

664.	Half-life period for a first order reaction is __________ the initial concentration of the reactant.$?
A.	Directly proportional to
B.	Inversely proportional to
C.	Independent of
D.	None of these
Answer» D. None of these

Discussion

665.	Pick out the correct statement$?
A.	Reactions with high activation energies are very temperature sensitive
B.	Chemical equilibrium is a static state
C.	A photochemical reaction is catalysed by light
D.	A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction
Answer» B. Chemical equilibrium is a static state

Discussion

666.	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.$?
A.	0.5
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

667.	The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is$?
A.	0.5
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

668.	Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.$?
A.	Pore diffusion
B.	Gas film
C.	Chemical reaction
D.	None of these
Answer» B. Gas film

Discussion

669.	Velocity of a reaction depends upon the$?
A.	Nature of the reactants
B.	Concentration of the reactants
C.	Temperature at which the reaction is carried
D.	All of the above
Answer» E.

Discussion

670.	A catalyst is said to be a negative catalyst, ifit$?
A.	Retards the rate of reaction
B.	Reduces the value of equilibrium constant
C.	Does not initiate the reaction
D.	All of the above
Answer» B. Reduces the value of equilibrium constant

Discussion

671.	The half life period of a first order reaction is given by (where, K = rate constant. )$?
A.	1.5 K
B.	2.5 K
C.	0.693/K
D.	6.93 K
Answer» D. 6.93 K

Discussion

672.	The units of frequency factor in Arhenious equation$?
A.	Are the same as those of the rate constant
B.	Depend on the order of the reaction
C.	Depend on temperature, pressure etc. of the reaction
D.	Are cycles per unit time
Answer» B. Depend on the order of the reaction

Discussion

673.	Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?$?
A.	Operating conditions (e.g. pressure and temperature)
B.	Rate constant
C.	Density of mixture
D.	None of these
Answer» D. None of these

Discussion

674.	Which of the following is not a chemical step in a fluid solid catalytic reaction?$?
A.	Surface chemical reaction
B.	Adsorption
C.	Desorption
D.	None of these
Answer» E.

Discussion

675.	The performance of a cascade of CSTR's can be improved by adding$?
A.	A P.F. reactor in series
B.	A P.F. reactor in parallel
C.	More CSTR's in series
D.	More CSTR's in parallel
Answer» D. More CSTR's in parallel

Discussion

676.	Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.?
A.	Pore diffusion
B.	Gas film
C.	Chemical reaction
D.	None of these
Answer» B. Gas film

Discussion

677.	Velocity of a reaction depends upon the?
A.	Nature of the reactants
B.	Concentration of the reactants
C.	Temperature at which the reaction is carried
D.	All of the above
Answer» E.

Discussion

678.	Knudsen diffusion is directly proportional to?
A.	T
B.	‚Äö√ √∂T
C.	1/‚Äö√ √∂T
D.	T‚Äö√á√á
Answer» C. 1/‚Äö√ √∂T

Discussion

679.	The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is?
A.	0.5
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

680.	A reaction which is catalysed by a base is catalysed by all substances which have a tendency to?
A.	Lose a proton
B.	Gain a proton
C.	Gain an electron
D.	None of these
Answer» C. Gain an electron

Discussion

681.	Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.?
A.	Increases
B.	Remains unchanged
C.	Decreases
D.	Unpredictable from the data
Answer» D. Unpredictable from the data

Discussion

682.	A catalyst is said to be a negative catalyst, ifit?
A.	Retards the rate of reaction
B.	Reduces the value of equilibrium constant
C.	Does not initiate the reaction
D.	All of the above
Answer» B. Reduces the value of equilibrium constant

Discussion

683.	Specific rate constant for a second order reaction?
A.	Is independent of temperature
B.	Varies with temperature
C.	Depends on the nature of the reactants
D.	Both B and C
Answer» E.

Discussion

684.	Pick out the correct statement?
A.	Reactions with high activation energies are very temperature sensitive
B.	Chemical equilibrium is a static state
C.	A photochemical reaction is catalysed by light
D.	A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction
Answer» B. Chemical equilibrium is a static state

Discussion

685.	Half-life period for a first order reaction is __________ the initial concentration of the reactant.?
A.	Directly proportional to
B.	Inversely proportional to
C.	Independent of
D.	None of these
Answer» D. None of these

Discussion

686.	In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure??
A.	N‚Äö√á√á + O‚Äö√á√á ‚Äö√°√£ 2NO
B.	PCl3 + Cl‚Äö√á√á ‚Äö√°√£ PCl5
C.	N + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â
D.	2SO‚Äö√á√á + O‚Äö√á√á ‚Äö√°√£ 2SO‚Äö√á√â
Answer» B. PCl3 + Cl‚Äö√á√á ‚Äö√°√£ PCl5

Discussion

687.	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.?
A.	0.5
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

688.	Promoter.?
A.	Initiates a chemical reaction and is a catalyst by itself
B.	Atlers the position of equilibrium in a reversible reaction
C.	Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals
D.	All of the above
Answer» D. All of the above

Discussion

689.	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??
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

690.	The exit age distribution curve E(t) for an ideal CSTR with the average residence time, ≈ì√ë, is given by?
A.	E-t/≈ì√ë
B.	E-t/≈ì√ë/T
C.	1 - e-t/≈ì√ë
D.	1 - (e-t/≈ì√ë/T)
Answer» C. 1 - e-t/≈ì√ë

Discussion

691.	Which of the following is a controlling factor in very fast heterogeneous reaction??
A.	Heat and mass transfer effects
B.	Pressure
C.	Temperature
D.	Composition of reactant
Answer» B. Pressure

Discussion

692.	A batch adiabatic reactor at an initial temperature of 373¬¨‚àûK is being used for the reaction, A ‚Äö√ú√≠ B. Assume the heat of reaction is - 1kJ/mole at 373¬¨‚àûK 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.	5¬¨‚àûC
B.	10¬¨‚àûC
C.	20¬¨‚àûC
D.	100¬¨‚àûC
Answer» C. 20¬¨‚àûC

Discussion

693.	The half life period of a first order reaction is given by (where, K = rate constant. )?
A.	1.5 K
B.	2.5 K
C.	0.693/K
D.	6.93 K
Answer» D. 6.93 K

Discussion

694.	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.	Langmuir
B.	There is no dynamic equilibrium between successive layer
C.	The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process
D.	None of these
Answer» C. The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

Discussion

695.	In an exothermic reaction, the energy of the reacting substances as compared to that of products is?
A.	More
B.	Less
C.	Same
D.	Either A or B, depends on order of reaction
Answer» B. Less

Discussion

696.	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?
A.	Blood
B.	Saliva
C.	Intestine
D.	Gland
Answer» C. Intestine

Discussion

697.	In a continuous flow stirred tank reactor, the composition of the exit stream?
A.	Is same as that in the reactor
B.	Is different than that in the reactor
C.	Depends upon the flow rate of inlet stream
D.	None of these
Answer» B. Is different than that in the reactor

Discussion

698.	If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to?
A.	(CA)n
B.	(1/2)n.CA
C.	(CA)1/n
D.	(CA)1/2n
Answer» C. (CA)1/n

Discussion

699.	Promoter is added to the catalyst to improve its?
A.	Porosity
B.	Sensitivity
C.	Surface area
D.	None of these
Answer» C. Surface area

Discussion

700.	Which of the following fixes the volume of a batch reactor for a particular conversion and production rate??
A.	Operating conditions (e.g. pressure and temperature)
B.	Rate constant
C.	Density of mixture
D.	None of these
Answer» D. None of these

Discussion

Explore topic-wise MCQs in Chemical Engineering.

Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature.$?

In flow reactors, the performance equations interrelate the rate of reaction to the$?

The residence time distribution of an ideal CSTR is$?

Which of the following is a controlling factor in very fast heterogeneous 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?$?

The exit age distribution curve E(t) for an ideal CSTR with the average residence time, ≈ì√ë, is given by$?

Knudsen diffusion is directly proportional to$?

Specific rate constant for a second order reaction$?

A reaction which is catalysed by a base is catalysed by all substances which have a tendency to$?

Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.$?

In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure?$?

Promoter.$?

Half-life period for a first order reaction is __________ the initial concentration of the reactant.$?

Pick out the correct statement$?

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 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.$?

Velocity of a reaction depends upon the$?

A catalyst is said to be a negative catalyst, ifit$?

The half life period of a first order reaction is given by (where, K = rate constant. )$?

The units of frequency factor in Arhenious equation$?

Which of the following fixes the volume of a batch reactor for a particular conversion and production rate?$?

Which of the following is not a chemical step in a fluid solid catalytic reaction?$?

The performance of a cascade of CSTR's can be improved by adding$?

Effectiveness factor of a catalyst pellet is a measure of the __________ resistance.?

Velocity of a reaction depends upon the?

Knudsen diffusion is directly proportional to?

The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is?

A reaction which is catalysed by a base is catalysed by all substances which have a tendency to?

Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.?

A catalyst is said to be a negative catalyst, ifit?

Specific rate constant for a second order reaction?

Pick out the correct statement?

Half-life period for a first order reaction is __________ the initial concentration of the reactant.?

In which of the following gaseous phase reversible reactions, the product yield can not be increased by the application of high pressure??

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.?

Promoter.?

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??

The exit age distribution curve E(t) for an ideal CSTR with the average residence time, ≈ì√ë, is given by?

Which of the following is a controlling factor in very fast heterogeneous reaction??

The half life period of a first order reaction is given by (where, K = rate constant. )?

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??

In an exothermic reaction, the energy of the reacting substances as compared to that of products is?

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?

In a continuous flow stirred tank reactor, the composition of the exit stream?

If CA is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to?

Promoter is added to the catalyst to improve its?

Which of the following fixes the volume of a batch reactor for a particular conversion and production rate??