Question

Volume of gases evolved when dil. ${\text{H}}_{\text{2}}\text{S}{\text{O}}_{\text{4}}$ is electrolysed using 2F at STP is;

• A. 22.4 L
• B. 11.2 L
• C. 33.6 L
• D. 44.8 L

Answer 1

Answer: (A), (D)

22.4 L
44.8 L

Electrolysis of ${\text{H}}_{\text{2}}\text{S}{\text{O}}_{\text{4}}$ gives following two reactions:

$\text{2}{\text{H}}^{+}+2e^{-}\to {\text{H}}_2$
$2{\text{H}}_{\text{2}}\text{O}\to {\text{O}}_2+2{\text{e}}^{-}+4{\text{H}}^{+}$

2 mole of electrons give 1 mole of ${\text{O}}_{\text{2}}$ and ${\text{H}}_2$ each.

So, $2F$ of electricity gives 2 moles of total gases.
Volume of 1 mole = 22.4 L
Volume of 2 moles = 44.8 L

Hence (A) and (D) both are the correct option.