Explore topic-wise MCQs in Chemistry.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

The rate constant of a reaction is 6 10-3 s-1 at 50 and 9 10-3 s-1 at 100 C. Calculate the energy of activation of the reaction.

A. 6.123 kJ mol<sup>-1</sup>
B. 8.124 kJ mol<sup>-1</sup>
C. 12.357 kJ mol<sup>-1</sup>
D. 18.256 kJ mol<sup>-1</sup>
Answer» C. 12.357 kJ mol<sup>-1</sup>
Discussion
2.

What is the value of rate constant k if the value of the activation energy Ea and the frequency factor A are 49 kJ / mol and 9 1010 s-1 respectively? (T = 313 K)

A. 6 10<sup>2</sup> s<sup>-1</sup>
B. 9 10<sup>2</sup> s<sup>-1</sup>
C. 6 10<sup>-2</sup> s<sup>-1</sup>
D. 3 10<sup>2</sup> s<sup>-1</sup>
Answer» B. 9 10<sup>2</sup> s<sup>-1</sup>
Discussion
3.

The activation energy of a reaction is 50 kJ mol-1 and the value of rate constant at 300 K is 2.5 10-5 sec-1. What is the value of the frequency factor, A?

A. 4228.53 s<sup>-1</sup>
B. 3829.69 s<sup>-1</sup>
C. 7596.45 s<sup>-1</sup>
D. 6565.35 s<sup>-1</sup>
Answer» D. 6565.35 s<sup>-1</sup>
Discussion
4.

What is R in the equation k = Ae-Ea/RT?

A. R = 8.314 J K<sup>-1</sup> mol<sup>-1</sup>
B. R = 3.184 J K<sup>-1</sup> mol<sup>-1</sup>
C. R = 4.318 J K<sup>-1</sup> mol<sup>-1</sup>
D. R = 1.438 J K<sup>-1</sup> mol<sup>-1</sup>
Answer» B. R = 3.184 J K<sup>-1</sup> mol<sup>-1</sup>
Discussion
5.

Which of the following represents the Boltzmann factor?

A. e<sup>-E<sub>a</sub></sup>
B. e<sup>E<sub>a</sub></sup>
C. e<sup>-E<sub>a</sub>/RT</sup>
D. e<sup>E<sub>a</sub>/RT</sup>
Answer» D. e<sup>E<sub>a</sub>/RT</sup>
Discussion
6.

Which of the following is the correct Arrhenius equation?

A. k = A e<sup>E<sub>a</sub>/RT</sup>
B. k = A e<sup>E<sub>a</sub>/T</sup>
C. k = A e<sup>E<sub>a</sub>/R</sup>
D. k = A e<sup>-E<sub>a</sub>/RT</sup>
Answer» E.
Discussion
7.

What happens to the peak of the curve in the Maxwell-Boltzmann distribution graph if temperature increases?

A. Shifts forward and upward
B. Shifts forward and downward
C. Shifts backward and upward
D. Shifts backward and downward
Answer» C. Shifts backward and upward
Discussion
8.

The rate of reaction increases with a rise in temperature.

A. True
B. False
Answer» B. False
Discussion
9.

Which of the following is the correct expression for the temperature coefficient (n)?

A. n = Rate constant at T + 10 /Rate constant at T
B. n = Rate constant at T + 20 /Rate constant at T
C. n = Rate constant at T + 30 /Rate constant at T
D. n = Rate constant at T + 40 /Rate constant at T
Answer» B. n = Rate constant at T + 20 /Rate constant at T
Discussion
10.

The rate of a reaction depends on the temperature.

A. True
B. False
Answer» B. False
Discussion