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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

Options

  1. AB > D > C > A
  2. BA > C > B > D
  3. CC > B > D > A
  4. DD > A > B > C

Correct answer

C. C > B > D > A

Step-by-step 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 competeting.

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