Bihar Board - Class 12 - Chemistry - Chapter 4: Chemical Kinetics Multiple Choice Questions ( MCQs)

The multiple choice questions for Chapter 4: Chemical Kinetics of Class 12 Chemistry are provided here in English. These questions are based on the NCERT curriculum for Class 12. They are designed to help students assess their understanding of the key concepts covered in the chapter. These multiple choice questions will be useful not only for the Class 12 board exams but also for entrance exams like NEET. The questions for Bihar Board Class 12 Chemistry, Chapter 4: Chemical Kinetics, have been prepared by expert teachers at Vidyakul.

                                    Multiple Choice Question

1. The rate at which a substance reacts, depends upon its

(A) Atomic mass
(B) Equivalent mass
(C) Molecular mass
(D) Active mass

Answer : (D) Active mass

2. The study of reaction kinetics is called __________.

(A) Rate of reaction

(B) Mechanism of reaction

(C) Factors which affect the rate of reaction

(D) All of the mentioned

Answer: (D) All of the mentioned

Download this PDF

3. The reaction rate constant can be defined as the rate of reaction when each reactant’s concentration is ___________.

(A) Zero

(B) Unity

(C) Doubled the initial concentration

(D) Infinite

Answer: (B) Unity

4. Only a simple homogeneous reaction requires which of the following methods?

(A) Integration method

(B) Half-life period method

(C) Graphical method

(D) Ostwald’s isolation method

Answer: (A) Integration method

5. For a chemical reaction, X+2Y Z , if the rate of appearance of Z is 0.50 moles per liter per hour, then the rate of disappearance of Y is

(A) 0.5 mol L-1 hr-1

(B) 1.0 mol L-1 hr-1

(C) 0.25 mol L-1 hr-1

(D) cannot be predicted

(B) 1.0 mol L-1 hr-1

6. For the reaction, NO2 (g) + CO (g) NO (g) , the correct expression for the rate of the reaction is

(A) rate = - d [NO2]dt

(B) rate = - d [CO2]dt

(C) rate = d [NO2]- d [CO]dt

(D) rate = d [CO2]dt

Answer : (A) rate = - d [NO2]dt

7. The rate of a reaction is primarily determined by the slowest step. This step is called

(A) rate determining step

(B) activation step

(C) reaction rate step

(D) none of these.

Answer : (A) rate determining step

8. For a chemical reaction A B , it is found that the rate of the reaction quadruples when the concentration of A is doubled. The rate expression for the reaction is, rate = k [A]n where the value of n is

(A) 1

(B) 2

(C) 0

(D) 3

Answer: (B) 2

9. A + 2B C+ D . If -d [A]dt=5 10-4 mol L-1 s-1, Then -d [B]dt is

(A) 2.5 10-4 mol L-1 s-1

(B) 5.0 10-4 mol L-1 s-1

(C) 2.5 10-3 mol L-1 s-1

(D) 1.0 10-3 mol L-1 s-1

Answer : (D) 1.0 10-3 mol L-1 s-1