Pick out the correct statement. In catalytic reactions, the catalyst reacts with

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Question
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.

Correct Answer

A catalyst lowers the activation energy of the reacting molecules.

Chemical Reaction Engineering problems

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1. 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

3. 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.

5. In a consecutive reaction system when E₁ is much greater than E₂, 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 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

8. 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.

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