જ્યારે કોષ સંપૂર્ણ ડિસ્ચાર્જે થાય ત્યારે $E_{cell} = 0 $ થાય.
$\therefore \,\,\,{E_{cell}} = \,\,\frac{{0.0592}}{2}\,\,\log \,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}$
$\,\,\therefore \,\,\,\frac{{1.10}}{{0.0296}}\,\, = \,\,{\log _{10}}\,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}$
$[\therefore \,\,37.5\,\, = \,\,{\log _{10}}\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}\,\,\,\,\,\therefore \,\,\frac{{[Z{n^{2 + }}]}}{{[C{u^{2 + }}]}}\,\, = \,\,{10^{37.3}}]$
$A$. $\mathrm{Fe}$ $B$. $\mathrm{Mn}$ $C$. $\mathrm{Ni}$ $D$. $\mathrm{Cr}$ $E$. $\mathrm{Cd}$
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