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

Step-by-step 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.