Question

There are three samples of $H_2{O}_2$ labelled as $10vol;15vol;20vol$. Half litre of each sample is mixed and then diluted with equal volume of water. Calculate volume strength of the resultant solution.

• A. $1.339$
• B. $7.5$
• C. $5.0$
• D. $2.68$

Answer 1

Answer: (B)

We know, $V=5.6\times N$
$N_1=\frac{10}{5.6};N_2=\frac{15}{5.6};N_3=\frac{20}{5.6}$
$N_1{V}_1+N_2{V}_2+N_3{V}_3=N_R{V}_R$
$\frac{10}{5.6}\times \frac{1}{2}+\frac{15}{5.6}\times \frac{1}{2}+\frac{20}{5.6}\times \frac{1}{2}=N_R\times 3$
or $N_R=1.339$
or $V=N_R\times 5.6=1.339\times 5.6=7.5$