1. The rate of reaction
A. Increases as the reaction proceeds
B. Decreases as the reaction proceeds
C. Remains the same as the reaction proceeds
D. May decrease or increase as the reaction proceeds
✅ The correct answer is option B.
Chemical Kinetics MCQs
2. The addition of a catalyst to the reaction system
A. Increases the rate of forwarding reaction only
B. Increases the rate of the reverse reaction
C. Increases the rate of forwarding but decreases the rate of backward reaction
D. Increases the rate of forward as well as backward reaction equally
✅ The correct answer is option D.
3. The specific rate constant of a first order reaction depends on the
A. Time
B. The concentration of the reactant
C. Temperature
D. The concentration of the product
✅ The correct answer is option C.
4. On increasing the temperature the rate of reaction increases mainly because
A. The activation energy of the reaction increases
B. The concentration of the reacting molecules increases
C. Collision frequency increases
D. None of these
✅ The correct answer is option C.
5. -d[N2O5]/dt represents
A. The rate of formation of N2O5
B. The rate of decomposition of N2O5
C. Order of the reaction
D. None
✅ The correct answer is option B.
6. The value of activation energy is primarily determined by
A. Temperature
B. Effective collision
C. Concentration of reactants
D. Chemical nature of reactants and products
✅ The correct answer is option B.
7. Sum of exponents of molar concentration is called
A. Order of reaction
B. Molecularity
C. Rate of reaction
D. Average of reaction
✅ The correct answer is option A.
8. Spontaneous reactions are
A. Moderate
B. Slow
C. Fast
D. Not natural
✅ The correct answer is option C.
9. In rate expression the concentration of reactants is negative. It shows
A. The concentration of reactant does not change
B. The concentration of product increases
C. The concentration of reactant decreases
D. The concentration of reactant increases
✅ The correct answer is option C.
10. Unit of the rate of reaction is
A. Moles dm-3 sec-1
B. Moles dm-3
C. Moles sec-1
D. Mol-1 dm3 sec-1
✅ The correct answer is option A.