Question

1 mol of $NaCl{O}_4$ is to be produced from the electrolysisi of $NaCl{O}_3$.FInd the volume of $H_2$ evolved at STP in the time during which 12.25 g of $NaC{l}_4$ are produced.

• A. $1.12L$
• B. $5.2L$
• C. $2.24L$
• D. none

Answer 1

The correct option is C $2.24L$

$NaCl{O}_3+H_{2}O\to NaCl{O}_4+2H^{\oplus }+2e^{-}$
$2H^{\oplus }+2e^{-}\to H_2$
2 F = 1 mol $NaCl{O}_4$
$\Rightarrow$ Number of Faradays required = 2
$\frac{12.5}{122.5}molNaCl{O}_4=2\times \frac{12.5}{122.5}F=0.2F$
$\Rightarrow$ 0.2 F are liberated.
2 F = 1 mol $H_2$
$\Rightarrow$ Moles of $H_2$ produced = 0.1
Volume of $H_2$ = 2.24 L.