Chemical Kinetics Test

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Chemical Kinetics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The units of rate of reaction and its rate constant

A
are identical

B
are quite independent of each other

C
depend on the experimental conditions of the reaction

D
are related to each other through a definite expression depending upon the order of the reaction

Solution

The units of rate of reaction and its rate constant are related to each other through a definite expression depending upon the order of the reaction.

For example: The rate constant, k, has units of sec^-1 for a first-order reaction. For a second-order reaction, the rate of reaction is directly proportional to the square of the concentration of one of the reactants. The rate constant, k, has units of L mole^-1 sec^-1.
Question 2
1 / -0

The following question has four choices, out of which ONLY ONE is correct.

Which of the following statements is not true regarding reaction kinetics?

A
A catalyst speeds up a reaction by lowering the activation energy for the process.

B
Rise of temperature increases the rate as the number of effective collisions increases.

C
Increase of concentration speeds up a reaction as it increases the collision frequency.

D
Removal of product from the reaction vessel as soon as it is formed increases the reaction rate as it increases the collision frequency of the reactant molecules.

Solution

In case of a reversible reaction, the removal of product from the reaction vessel as soon as it is formed shifts the equilibrium in the forward direction, but it does not affect the rate of the reaction. Hence, the statement in option (4) is incorrect.
Question 3
1 / -0

If the initial concentration of a reactant of a zero order reaction is reduced by half, the time for half decomposition

A
remains the same

B
increases to twice its original value

C
decreases to half its original value

D
increases to four times its original value

Solution

For a zero order reaction, half-life is proportional to initial concentration. So, reduction of initial concentration to half of its original value reduces the half-life to half of its original value.
Question 4
1 / -0

In a chemical reaction, if a linear (y = mx) graph is obtained between half-life and concentration of reactants, then what is the order of the reaction?

A
0

B
1

C
2

D
3

Solution

This option is correct because t_1/2 is directly proportional to [A_o]^{1 - n}.
Question 5
1 / -0

The rate constant of reaction A → 2B is 1.0 × 10^-3 mol L^-1 min^-1. If the initial concentration of A is 1.0 mol L^-1, then what is the concentration of B after 100 minutes?

A
0.1 mol L^-1

B
0.2 mol L^-1

C
0.9 mol L^-1

D
1.8 mol L^-1

Solution

The unit of K is mol L^-1 min^-1, which corresponds to a zero order reaction.
∴ Rate = K = Constant
Concentration of A which has reacted in 100 minutes = 100 × K = 100 × 1.0 × 10^-3 = 0.1 mol L^-1
∴ Concentration of B after 100 minutes = 2 × 0.1 = 0.2 mol L^-1

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Chemical Kinetics Test - 3

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Chemical Kinetics Test - 3

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Question 1

are identical

are quite independent of each other

depend on the experimental conditions of the reaction

are related to each other through a definite expression depending upon the order of the reaction

Solution

Question 2

A catalyst speeds up a reaction by lowering the activation energy for the process.

Rise of temperature increases the rate as the number of effective collisions increases.

Increase of concentration speeds up a reaction as it increases the collision frequency.

Removal of product from the reaction vessel as soon as it is formed increases the reaction rate as it increases the collision frequency of the reactant molecules.

Solution

Question 3

remains the same

increases to twice its original value

decreases to half its original value

increases to four times its original value

Solution

Question 4

0

1

2

3

Solution

Question 5

0.1 mol L-1

0.2 mol L-1

0.9 mol L-1

1.8 mol L-1

Solution

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0.1 mol L^-1

0.2 mol L^-1

0.9 mol L^-1

1.8 mol L^-1