Chemistry - Electrochemistry Question with Solution | TestHub

$\text{(i)}{\text{Ag}}^{\text{+}}\text{(aq)}\text{+}\underset{\begin{array}{l}\text{1}\text{mol}\text{=}\text{1}\text{F}\\ \text{3}\text{F}\end{array}}{{\text{e}}^{-}}\to \underset{\begin{array}{l}\text{1}\text{mol}\\ \text{3}\text{mol}\end{array}}{\text{Ag}\text{(s)}}$
$\text{(ii)}{\text{Ni}}^{\text{2+}}\text{(aq)}\text{+}\underset{\begin{array}{l}\text{2}\text{mol}\text{=}\text{2}\text{F}\\ \text{3}\text{F}\end{array}}{{\text{2e}}^{-}}\to \underset{\begin{array}{l}\text{1}\text{mol}\\ \text{3/2}\text{mol}\end{array}}{\text{Ni}\text{(s)}}$
$\text{(iii)}{\text{Co}}^{\text{+}}\text{(aq)}\text{+}\underset{\text{3}\text{mol}\text{=}\text{3}\text{F}}{{\text{3e}}^{-}}\to \underset{\text{1}\text{mol}}{\text{Co}\text{(s)}}$
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.