Three Faraday of electricity is passed through aqueous solutions of A g N O 3 , N i S O 4 and C o C l 3 kept in three vessels using inert electrodes. The ratio in mol in which the metals Ag, Ni and Co will be deposited is

Question

Three Faraday of electricity is passed through aqueous solutions of A g N O 3 , N i S O 4 and C o C l 3 kept in three vessels using inert electrodes. The ratio in mol in which the metals Ag, Ni and Co will be deposited is, 3:2:1, 1:2:3, 2:3:6, 6:3:2

MARKS App · Accepted Answer

(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.

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