Question

Decomposition of $H_{2}O$ is a first order reaction. A 16 volume solution of $H_2{O}_2$ of half-life period 30 minutes is present at the start. When will the solution become one volume?

• A. After 120 minutes
• B. After 90 minutes
• C. After 60 minutes
• D. After 140 minutes

Answer 1

The correct option is A After 120 minutes

$16\underset{t\frac{1}{2}}{\overset{30min}{\to }}8\underset{t\frac{1}{2}}{\overset{30min}{\to }}4\underset{t\frac{1}{2}}{\overset{30min}{\to }}2\underset{t\frac{1}{2}}{\overset{30min}{\to }}1$

After $120min$ solution become $1$ vol.