Question

The rate of reaction of a substance depends upon

• A. Atomic mass
• B. Equivalent mass
• C. Molecular mass
• D. Active mass

Hint:

The rate of a reaction depends on the concentration of reactants, also referred to as the active mass, not their atomic, molecular, or equivalent masses.

Answer 1

The Correct Option is D

Step 1: Understanding the rate of reaction.
The rate of a chemical reaction depends on the concentration of the reacting substances, which is referred to as the active mass. The rate is proportional to the active mass of the reactants. Step 2: Analysis of options.
(A) Atomic mass: Atomic mass does not directly affect the rate of reaction.
(B) Equivalent mass: Equivalent mass is related to the amount of substance reacting, but it is not the determining factor for the reaction rate.
(C) Molecular mass: Molecular mass alone does not determine the rate of a reaction; it is the concentration (or active mass) that matters.
(D) Active mass: Correct — The rate of reaction is directly related to the active mass (or concentration) of the reactants.
Step 3: Conclusion.
The correct answer is (D) because the rate of reaction depends on the active mass, which is the concentration of reactants in the reaction.