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Chemical Reaction Engineering Online Exam Quiz

Important questions about Chemical Reaction Engineering. Chemical Reaction Engineering MCQ questions with answers. Chemical Reaction Engineering exam questions and answers for students and interviews.

1. In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.

Options

A : 100

B : 1000

C : 10000

D : 100000

2. The single parameter model proposed for describing non-ideal flow is the __________ model.

Options

A : tank in series

B : dispersion

C : both (a) & (b)

D : neither (a) nor (b).

3. From among the following, choose one which is not an exothermic process.

Options

A : Methanol synthesis

B : Catalytic cracking

C : Ammonia synthesis

D : Oxidation of sulphur

4. ' 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.

Options

A : first

B : second

C : third

D : any

5. In a consecutive reaction system when E 1 is much greater than E 2 , the yield of B increases with the

Options

A : increase of temperature.

B : decrease of temperature.

C : increase in initial concentration of A .

D : decrease in initial concentration of A .

6. The rate constant of a chemical reaction decreases by decreasing the

Options

A : pressure

B : concentration of reactants

C : temperature

D : duration of reaction

7. For a heterogeneous catalytic reaction

Options

A : free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction.

B : a relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important.

C : the catalyst does not form an intermediate complex with the reactant.

D : the surface of the catalyst does not play an important role during reaction.

8. __________ explains the mechanism of catalysis.

Options

A : Activated complex theory

B : Collision theory

C : Thermodynamics

D : None of these

9. What is the order of a chemical reaction, , if the rate of formation of ' C ', increases by a factor of 2.82 on doubling the concentration of ' A ' and increases by a factor of 9 on trebling the concentration of ' B '?

Options

A : 7/2

B : 7/4

C : 5/2

D : 5/4

10. Pick out the correct statement.

Options

A : In catalytic reactions, the catalyst reacts with the reactants.

B : A catalyst initiates a chemical reaction.

C : A catalyst lowers the activation energy of the reacting molecules.

D : A catalyst can not be recovered chemi cally unchanged at the end of the chemical reaction.

1. 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

Options

A : 8987°K

B : 9210°K

C : 8764°K

D : 8621°K

2. With decrease in temperature, the equilibrium conversion of a reversible endother-mic reaction

Options

A : decreases

B : increases

C : remains unaffected

D : increases linearly with temperature

3. A batch reactor is suitable for

Options

A : achieving cent percent conversion of reactants into products.

B : large scale gaseous phase reactions.

C : liquid phase reactions.

D : obtaining uniform polymerisation products in highly exothermic reactions.

4. The dimensions of rate constant for reaction 3 A ? B are (l/gm mole)/min. Therefore the reaction order is

Options

A : 0

B : 1

C : 2

D : 3

5. 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

Options

A : 0

B : 1

C : 2

D : 3

6. The reason why a catalyst increases the rate of reaction is that, it

Options

A : decreases the energy barrier for reaction.

B : increases the activation energy.

C : decreases the molecular collision diameter.

D : none of these.

7. For a zero order chemical reaction, the

Options

A : half life period is directly proportion to the initial concentration of the reac-tants.

B : plot of products concentration with time is a straight line through the origin.

C : products concentration increases linerarly with time.

D : all (a), (b) and (c).

8. A catalyst loses its activity due to

Options

A : loss in surface area of the active component.

B : agglomeration of metal particles caused by thermal sintering of the solid surface.

C : covering of the catalytic active sites by a foregin substance.

D : all (a), (b) and (c).

10. Radioactive decay follows __________ order kinetics.

Options

A : first

B : second

C : third

D : zero.

1. '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

Options

A : pressure

B : temperature

C : both (a) & (b)

D : neither (a) nor (b)

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