$(i)\, Cu^{2+} + 2e^- \rightarrow Cu\,,$ $ E^o = 0.337\, V$
$(ii)\, Cu^{2+} + e^- \rightarrow Cu^+\,,$ $ E^o = 0.153\, V$
તો પ્રક્રિયા $Cu^+ + e^- \rightarrow Cu$ માટે $E^o$........... $V$ થશે.
For reaction, $C u^{2+}+2 e^{-} \rightarrow C u$
$\Delta G^{0}=-2 \times F \times 0.337 \ldots(i)$
For reaction, $C u^{+} \rightarrow C u^{2+}+e^{-}$
$\Delta G^{0}=-1 \times F \times 0.153 \quad \dots(i i)$
Adding Eqs. (i) and (ii), we get
$C u^{+}+e^{-} \rightarrow C u, \Delta G^{0}=-0.521 F$
$\Delta G^{0}=-n F E^{0}-0.521 F=-n F E^{0}$
$\therefore E^{0}=0.52 V$
$\mathrm{M}\left|\mathrm{M}^{2+}\right||\mathrm{X}| \mathrm{X}^{2-}$
ધારોકે $\mathrm{E}_{\left(\mathrm{M}^{2+} / \mathrm{M}\right)}^0=0.46 \mathrm{~V}$ અને $\mathrm{E}_{\left(\mathrm{x} / \mathrm{X}^{2-}\right)}^0=0.34 \mathrm{~V}$.
નીચે આપેલામાંથી ક્યું સાયું છે ?
$Cr\, | \,Cr^{3+}_{(0.1\,M)}\,||\, Fe^{2+}_{(0.01\, M)}\,|\, Fe$