MCQ
Oleum is
- ACastor oil
- BOil of vitriol
- ✓Fuming ${H_2}S{O_4}$
- DNone of them
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$2X_2(s) + 3Y^{2+} (aq) \to 2X_2^{3+}(aq) + 3Y(s)$

$\mathop {{H_2}(Pt)}\limits_{1\,atm} \left| {\begin{array}{*{20}{c}}
{H_{aq}^ + }\\
{pH = 4}
\end{array}} \right|\left| {\begin{array}{*{20}{c}}
{A{g^ + }}\\
{xM}
\end{array}} \right|\begin{array}{*{20}{c}}
{Ag}\\
{}
\end{array}$
What is the value of $x$ ? ........... $\mathrm{M}$
( give : $E_{A{g^ + }|Ag}^o = + 0.8$ $\frac{{2.303\,RT}}{F} = 0.06 $)