Ratio of number of Faradays of electricity required to deposit magnesium, aluminium and sodium in equimolar ratio on electrolysis of their respective molten salt is _____

Options

A. `2 : 3 : 2`
B. `2 : 1 : 1`
C. `2 : 3 : 1`
D. `4 : 6 : 1`

Explanation

Electrode reactions involved are
`Mg^(+2) + 2e^(-) rarr Mg`
`Al^(+3) + 3e^(-) rarr Al`
`Na^(+) + e^(-) rarr Na`
1 mole of Mg requires 2 Faradays
1 mole of Al requires 3 Faradays.
1 mole of sodium requires 1 Faraday
Ratio of number of Faradays `= 2 : 3: 1`