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# An electric current is passed through two electrolytic cells connected in series.One containing a solution of silver nitrate and the other solution of $H_2SO_4$.What volume of oxygen measured at $25^{\large\circ}C$ and 750mm of Hg would be liberated from $H_2SO_4$ if 1mole and of $Ag^+$ are deposited from silver nitrate solution?

$\begin{array}{1 1}(a)\;4.2l&(b)\;6.2l\\(c)\;5.3l&(d)\;3.2l\end{array}$

1 mole of $Ag^+$=1 equivalent of $Ag^+$
$\therefore$ Equivalent of $O_2=\large\frac{22.4}{4}$$=5.6litres$ of NTP
$\therefore \large\frac{P_1\times V_1}{T_1}= \large\frac{P_2\times V_2}{T_2}$
$\large\frac{750\times V_1}{298}=\frac{760\times 5.6}{273}$
$\therefore V_1$(volume of oxygen at $25^{\large\circ}C$ and 750mm)=$\large\frac{760\times 5.6\times 298}{273\times 750}$
$\Rightarrow 6.2litres$
Hence (b) is the correct answer.