Question

When initial concentration of a reactant is doubled in a reaction, its halt-life period is not affected. The order of the reaction is:

• A. second
• B. more than zero but less than first
• C. zero
• D. first

Answer 1

The correct option is D first

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is 1. The half-life period $t_{1/2}$ of the first-order reaction is independent of the initial concentration of the reactant.

$t_{1/2}=\frac{0.693}{k}$