Question

The volume strength of $3N{H}_2{O}_2$ solution is:

• A. $11.2\text{V}$
• B. $8.4\text{V}$
• C. $22.4\text{V}$
• D. $16.8\text{V}$

Answer 1

Answer: (D)

$16.8\text{V}$

$3N$ means $3$ g eqwt. in $1$ L solution.

$N=\frac{\text{weight}}{\text{eq. wt.}}$.

$($eq. wt. for hydrogen peroxide$=17$ g$)$

Therefore, $3=\frac{\text{wt}}{17}$ or $\text{wt}=3\times 17=51$ g.

Now, from the equation, we know that $68$ g of $H_2{O}_2$ gives $22.4$ L of Oxygen.

Therefore, $51$ g of hydrogen peroxide gives $22.4\times \frac{51}{68}=16.8$ L.

Thus, volume strength is $16.8$ L, because volume strength is the volume of oxygen at STP given by one volume sample of hydrogen peroxide on heating.