Question

The order of reaction for which half-life period is independent of initial concentration is:

• A. zero
• B. first
• C. second
• D. third

Answer 1

The correct option is B first

For first order reaction, the half-life period is independent of initial concentration.

For first order reaction, the half-life period expression $\left(t_{1/2}\right)$ is given by the expression $t_{1/2}=\frac{0.693}{k}$, where k is the rate constant.

For nth order reaction, $t_{1/2}\propto \frac{1}{a^{n-1}}$.