Chemical Kinetics Test

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Chemical Kinetics Test - 3

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Weekly Quiz Competition

Question 1
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
Question 2
1 / -0

For a first-order reaction,

A
the degree of dissociation of reactants is equal to 1 – exp (– kt)

B
the pre-exponential factor in the Arrhenius equation has the dimension of time

C
the time taken for the completion of 75% reaction is thrice of half-life time

D
a plot of reciprocal of concentration of the reactant versus time is a straight line
Question 3
1 / -0

For a first-order reaction, the ratio of times to complete 99.9% and half of the reaction is

A
8

B
9

C
10

D
12
Question 4
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
Question 5
1 / -0

A catalyst is added to a reaction to increase the rate of reaction. Which of the following statements is correct?

A
A catalyst increases the activation energy between reactants and products and hence, lowers the potential energy barrier.

B
A catalyst provides an alternate pathway or reaction mechanism.

C
A catalyst alters △G, Gibbs energy of reaction.

D
A catalyst changes the equilibrium constant of a reaction.
Question 6
1 / -0

The chemical reaction in which reactants require high amount of activation energy are generally

A
Instantaneous

B
Fast

C
Slow

D
Spontaneous

Solution

As the energy of activation increases, more energy is required for reactants to complete the reaction hence chemical reaction become slow.
Question 7
1 / -0

The rate of chemical reaction becomes double for every 10^o rise in temperature because of

A
Increase in activation energy

B
Increase in number of collisions between molecules having energy greater than activation energy

C
Increase in number of activated molecules

D
Decrease in activation energy

Solution

With increase in temperature molecular collisions increases therefore rate of reaction doubles. With every 10⁰ rise in teperature, the number of molcules which bring about the chemical reaction become double, so rate of chemical reaction also double.
Question 8
1 / -0

A substance (initial concentration 'a') reacts according to zero-order kinetics. The time it takes for the completion of the reaction is

A
a/k

B
a/2k

C
k/a

D
2k/a

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Re-Attempt Weekly Quiz Competition

Chemical Kinetics Test - 3

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Chemical Kinetics Test - 3

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Question 1

0.1 mol L-1

0.2 mol L-1

0.9 mol L-1

1.8 mol L-1

Question 2

the degree of dissociation of reactants is equal to 1 – exp (– kt)

the pre-exponential factor in the Arrhenius equation has the dimension of time

the time taken for the completion of 75% reaction is thrice of half-life time

a plot of reciprocal of concentration of the reactant versus time is a straight line

Question 3

8

9

10

12

Question 4

remains the same

increases to twice its original value

decreases to half its original value

increases to four times its original value

Question 5

A catalyst increases the activation energy between reactants and products and hence, lowers the potential energy barrier.

A catalyst provides an alternate pathway or reaction mechanism.

A catalyst alters △G, Gibbs energy of reaction.

A catalyst changes the equilibrium constant of a reaction.

Question 6

Instantaneous

Fast

Slow

Spontaneous

Solution

Question 7

Increase in activation energy

Increase in number of collisions between molecules having energy greater than activation energy

Increase in number of activated molecules

Decrease in activation energy

Solution

Question 8

a/k

a/2k

k/a

2k/a

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0.1 mol L^-1

0.2 mol L^-1

0.9 mol L^-1

1.8 mol L^-1