Question

The rate constant of a reaction depends on

• A. Temperature
• B. The initial concentration of reactants
• C. Reaction time
• D. Reaction extent.

Answer 1

The correct option is A

Temperature

Explanation for correct option:

(A) Temperature

• The rate constant of a reaction depends on temperature, but it is unaffected by the initial concentration of the reactants, the duration of the reaction, or the extent of the reaction.
• Also, the rate constant depends on the surface area of the solid reactant, and the presence or absence of a catalyst.
• The rate constant depends on the nature of the reactants and the concentration or pressure of the reaction.
• So, in the option temperature is only there,

Explanation for incorrect options:

(B) The initial concentration of reactants

• As the concentration of reactant to products is measured in equilibrium. So, the rate does not depend on the initial concentration of reactants. So, it is an incorrect option.

(C) Reaction time

• The rate constant does not depend on the reaction time of the reaction. So, it is an incorrect option.

(D) Reaction extent.

• The rate constant does not depend on the reaction extent. So, it is an incorrect option.

Hence, the rate constant does depend on the temperature (A) of the reaction. So, this is the correct option.