Q20 / 90 · JEE Main 2014 (09 Apr Online) · Chemistry

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

  • A
    B > D > C > A
  • B
    A > C > B > D
  • Correct answer
    C
    C > B > D > A
  • D
    D > A > B > C

Solution

In complete cation electrolysis at cathode, the species having higher reduction potential is preferably reduced at cathode
E C ∘ > E B ∘ > E D ∘ > E A ∘
Hence,  C > B > D > A
will be the preference of deposition of these metals on competing.

Hence, the correct answer is option: 'C'.

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