A solution containing equimolar concentration of $\mathrm{SnCl}_2, \mathrm{NiCl}_2, \mathrm{MgCl}_2,

Question

A solution containing equimolar concentration of $\mathrm{SnCl}_2, \mathrm{NiCl}_2, \mathrm{MgCl}_2, \mathrm{AgNO}_3$, $\mathrm{AuCl}_3$ is being electrolyzed by using inert electrodes. The standard electrode potentials (in Volts) for each metal ions is $$ \mathrm{Sn}^{2+} / \mathrm{Sn}=-0.14 \mathrm{~V}, \mathrm{Ni}^{2+} / \mathrm{Ni}=-0.25 \mathrm{~V}, \mathrm{Mg}^{2+} / \mathrm{Mg}\=-2.36 \mathrm{~V}, \mathrm{Ag}^{+} / \mathrm{Ag}=0.80 \mathrm{~V} $$ and $\mathrm{Au}^{3+} / \mathrm{Au}=1.40 \mathrm{~V}$ \With an increasing voltage, the order of metal deposition on the cathode will be

Professor PC Thomas Classes · Answer

Discharge potential dictates the order of metal deposition at cathode.