The standard electrode potentials E M + / M o of four metals A, B, C and D are − 1 .2 V, , 0 .6 V , 0 .85 V and − 0 .76 V , respectively. The sequence of deposition of metals on applying potential is

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In complete cation electrolysis at cathode, the species having higher reduction potential is preferably reduced at cathode
$E_{C}^{\circ} > E_{B}^{\circ} > E_{D}^{\circ} > E_{A}^{\circ}$
Hence, C > B > D > A
will be the preference of deposition of these metals on competeting.

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