$Zn\left( s \right) + C{u^{2 + }}\left( {aq} \right) \rightleftharpoons Z{n^{2 + }}\left( {aq} \right) + Cu\left( s \right)$
Standard reaction enthalpy $\left( {{\Delta _r}{H^ - }} \right)$ ....... $\mathrm{kJ}$
$\Delta S=nF\left( \frac{dE}{dT} \right)=2\times 96500\,\,\times (-5\times {{10}^{-4}}J{{/}^{o}}C)=-96.5\,kJ$
at $298\,K$
$T\Delta S=298\times \,(-96.5\,\,J)\,=\,-\,28.8\,kJ$
at constant $T\,(=\,248\,K)$ and pressure
$\Delta G\, = \,\,\Delta H\, - \,\,T\Delta S{\mkern 1mu} $
$\Delta H\, = \,\,\Delta G\, + \,\,T\Delta S{\mkern 1mu} $
$=-386-28.8=-412.8\,kJ$
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Statement $(I)$ : $A$ Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities.
Statement $(II)$ : Blood is naturally occurring buffer solution whose $\mathrm{pH}$ is maintained by $\mathrm{H}_2 \mathrm{CO}_3 / \mathrm{HCO}_3$ concentrations.
In the light of the above statements, choose the correct answer from the options given below.
$(i)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{C{H_3} - {C^ \mathbf{-} }} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$
$(ii)$ $H _{2} C = CH - CH _{2}$
$(iii)$ $HC \equiv \stackrel{\ominus}{ C }$
$(iv)$ $\stackrel{\ominus}{ CH _{3}}$
$(v)$ $\stackrel{\ominus}{{ }_{ CN }}$