Question

The volume of gases evolved when dil. H2SO4H2SO4 is electrolyzed using 2 F at STP is:

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

Answer 1

The correct option is D $44.8$ L

Electrolysis of $H_{2}S{O}_4$ gives two reactions-

$2H^{+}+2e^{-}⟶H_2$

$2H_{2}O⟶O_2+2e^{-}+4H^{+}$

$2$ mole of electrons gives $1$ mole of $O_2$ and $H_2$ each.

Therefore, $2F$ gives $2$ moles of gases.

$\therefore$ Volume of $1$ mole of a gas $=22.4L$

$\Rightarrow$ Volume of $2$ mole of a gas $=2\times 22.4=44.8L$

Hence, $44.8L$ of gases will be evolved when dil. $H_{2}S{O}_4$ is electrolysed using $2F$ at STP.