Question

A sample of $H_2{O}_2$ is labelled $10vol$. Its percentage strength will be nearly _______% .

• A. $25$
• B. $30$
• C. $35$
• D. none of the above

Answer 1

Answer: (B)

$30$

$10$ volume of $H_2{O}_2$ solution means $1L$ of this solution will liberate $10L$ of Oxygen at NTP.

$2H_2{O}_2⟶2H_{2}O+O_{2}2\times 34=64g22.4L$

$22.4L$ of $O_2$ at NTP produced from $H_2{O}_2=68g$

$10L$ of $O_2$ at NTP produced from $H_2{O}_2=\frac{68\times 10}{22.4}=30.3g\approx 30g$

Strength of $H_2{O}_2$ in $10$ Vol. $=30g/L.$