Chemical Reaction Engineering

Question: For a zero order chemical reaction, the
[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).

Answer: Option D

Explanation:

No answer description available for this question.

Question: 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.
[A].

increase

[B].

increase exponentially

[C].

decrease

[D].

remain unchanged

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a semi-batch reactor,
[A].

mixing takes place in axial direction only.

[B].

velocity of reaction can be controlled.

[C].

condition similar to plug flow reactor exists.

[D].

residence time is constant.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of __________ reactions, the reaction rate does not decrease appreciably as the reaction proceeds.
[A].

catalytic

[B].

parallel

[C].

series

[D].

auto catalytic

Answer: Option D

Explanation:

No answer description available for this question.

Question: 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: Option B

Explanation:

No answer description available for this question.

Question: A catalyst in a chemical reaction __________ free energy change in the reaction.
[A].

increases

[B].

decreases

[C].

either (a) or (b); depends on the type of catalyst

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the rate of a chemical reaction becomes slower at a given temperature, then the
[A].

initial concentration of the reactants remains constant.

[B].

free energy of activation is lower.

[C].

entropy changes.

[D].

free energy of activation is higher.

Answer: Option D

Explanation:

No answer description available for this question.

Question: For a gaseous phase reaction, rate of reaction is equal to K. CA . CB. If the volume of the reactor is suddenly reduced to l/4th of its initial volume, then the rate of reaction compared to the original rate will be __________ times.
[A].

8

[B].

16

[C].

1/8

[D].

1/16

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a zero order reaction, reactants concentration does not change with time and the
[A].

time for half change is half the time taken for completion of the reaction.

[B].

time for half change is independent of the initial concentration.

[C].

time for completion of the reaction is independent of the initial concentration.

[D].

reaction rate is trebled when the initial concentration is trebled.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In an exothermic chemical reaction, the reactants compared to the products have
[A].

higher temperature

[B].

more energy

[C].

less energy

[D].

same energy.

Answer: Option B

Explanation:

No answer description available for this question.