Q43 / 199 · NTA Abhyas (NEET) 2020 · Chemistry · Electrochemistry

Three Faraday of electricity is passed through aqueous solutions of AgNO3,NiSO4 and CoCl3 kept in three vessels using inert electrodes. The ratio in mol in which the metals Ag, Ni and Co will be deposited is

  • A
    3:2:1
  • B
    1:2:3
  • C
    2:3:6
  • Correct answer
    D
    6:3:2

Solution

(i)  Ag + (aq) + e − 1 mol = 1 F      3 F → Ag (s) 1 mol 3 mol
(ii)  Ni 2+ (aq)  +  2e − 2 mol = 2 F       3 F → Ni (s)   1 mol 3/2 mol
(iii)  Co + (aq) +  3e − 3 mol = 3 F → Co (s) 1 mol
The required ratio of moles of Ag, Ni and Co is
3 mol Ag: 3/2 mol Ni : 1 mol Co or 6 mol Ag : 3 mol Ni : 2 mol Co.

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

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