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A solution containing \( 1.0 \mathrm{M} \) each of \( \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2} \), \( \quad \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}, \quad \mathrm{AgNO}_{3}, \quad \mathrm{Hg}\left(\mathrm{NO}_{3}\right)_{2} \) is being electrolysed using inert electrodes. The values of standard electrode potential are: \( \mathrm{Ag}^{+} \mid \mathrm{Ag}=0.80 \mathrm{~V} \), \( \mathrm{Hg}^{2+}\left|\mathrm{Hg}=0.79 \mathrm{~V}, \mathrm{Cu}^{2+}\right| \mathrm{Cu}=0.34 \mathrm{~V}, \mathrm{Mg}^{2+} \mid \mathrm{Mg}^{2} \) \( =-2.37 \mathrm{~V} \). With increasing voltage, the sequence of deposit of metals on the cathode will be
(a) \( \mathrm{Ag}, \mathrm{Hg}, \mathrm{Cu}, \mathrm{Mg} \)
(b) \( \mathrm{Mg}, \mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag} \)
(c) Ag, Mg, Cu
(d) \( \mathrm{Cu}, \mathrm{Hg}, \mathrm{Ag} \)
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