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Chemical Kinetics - SS2 Chemistry Past Questions and Answers - page 1

1

Which of the following factors can affect the rate of a chemical reaction?

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A

Temperature

 

B

Catalyst

 

C

Concentration of reactants

 

D

All of the above

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2

The rate of a chemical reaction is determined by:

 

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A

The concentration of the products

 

B

The concentration of the reactants

 

C

The concentration of the catalyst

 

D

The overall reaction order

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3

Which statement is true about catalysts?

 

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A

They increase the overall energy of the reaction.

 

B

They are consumed during the reaction.

 

C

They decrease the rate of reaction.

 

D

They provide an alternative reaction pathway.

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4

A reaction has a rate law of Rate = k [A]2 [B]. If the concentration of A is doubled and the concentration of B is tripled, how will the rate of the reaction change?

 

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A

The rate will remain the same.

 

B

The rate will be doubled.

 

C

The rate will be quadrupled.

 

D

The rate will increase by a factor of six.

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5

What is the overall reaction order for a reaction with the following rate law: Rate = k [X]2 [Y]1/2?

 

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A

1

 

B

2

 

C

3/2

 

D

2.5

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6

Which of the following is a unit for the rate constant (k) in a first-order reaction?

 

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A

mol/L

 

B

s-1

 

C

L/(mol·s)

 

D

L/mol

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7

At a higher temperature, the rate of a chemical reaction generally:

 

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A

Decreases

 

B

Remains the same

 

C

Doubles

 

D

Increases

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8

For a gaseous reaction, an increase in pressure will lead to an increase in the reaction rate when the reaction involves:

 

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A

A decrease in the number of moles of gas

 

B

An increase in the number of moles of gas

 

C

No change in the number of moles of gas

 

D

A change in the volume of the container

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9

Which of the following reactions is likely to have the fastest rate?

 

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A

A reaction with a large activation energy

 

B

A reaction with a small activation energy

 

C

A reaction with a high-energy transition state

 

D

A reaction with a stable intermediate

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10

In a reaction mechanism, the slowest step is known as the:

 

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A

Catalyst step

 

B

Rate-determining step

 

C

Intermediate step

 

D

Equilibrium step

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Chemical Kinetics - SS2 Chemistry (Page 1) - EduPadi Classroom