Question

The half life period of a first order reaction.

• A. $\frac{0.693}{t}$
• B. $\frac{0.693}{K}$
• C. $\frac{2.303}{t}$
• D. $\frac{0.303}{K_{1}}$

Answer 1

Answer: (B)

$\frac{0.693}{K}$

Answer 2

Derive $t_{1/2}$from $K_{t} = 2.303\log\frac{a}{a - x}$, putting $t = \frac{1}{2}$

and $x = \frac{a}{2}$. Therefore it is $\frac{0.693}{K}$.