Question

The rate constant and half life of a first order reaction are related to each other as:

• A. $t_{\frac{1}{2}}=\frac{0.693}{K}$
• B. $t_{\frac{1}{2}}=0.693\times K$
• C. $K=0.693\times t_{\frac{1}{2}}$
• D. $K\times t_{\frac{1}{2}}=\frac{1}{0.693}$

Answer 1

The correct option is A $t_{\frac{1}{2}}=\frac{0.693}{K}$

$t_{\frac{1}{2}}=\frac{0.693}{K}$

Where, $t_{\frac{1}{2}}$ is half life and $K$ is rate constant.

Hence, the correct option is $\text{A}$