Chemical Engineering - Chemical Reaction Engineering

6. 

Pick out the correct statement.

A. A chemical reaction accompanied by absorption of heat is called an exothermic reaction.
B. A chemical reaction accompanied by evolution of heat is called an endother-mic reaction.
C. The rate constant for a first order reaction does not change on changing the concentration units.
D. Chemical equilibrium state is dynamic in nature.

Answer: Option C

Explanation:

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7. 

The concentration of A in a first order reaction, A B, decreases

A. linearly with time.
B. exponentially with time.
C. very abruptly towards the end of the reaction.
D. logarithmically with time.

Answer: Option B

Explanation:

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8. 

The equilibrium constant of chemical reaction __________ in the presence of catalyst.

A. increases
B. decreases
C. remains unaffected
D. can either increase or decrease (depends on the type of catalyst)

Answer: Option C

Explanation:

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9. 

The order of a chemical reaction is

A. an experimentally determined quantity.
B. always equal to the total stoichiometric number of reactants.
C. never fractional.
D. none of these.

Answer: Option A

Explanation:

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10. 

A chemical reaction occurs, when the energy of the reacting molecules is __________ the activation energy of reaction.

A. less than
B. equal to
C. more than
D. equal to or more than

Answer: Option D

Explanation:

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