The same quantity of electricity is passed through aqueous AgNO3, aqueous CuSO4 and molten AlCl3 connected in series. The ratio of the number of moles of Ag, Cu and Al deposited is

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The same quantity of electricity is passed through aqueous $AgNO X_{3}$ , aqueous $CuSO X_{4}$ and molten $AlCl X_{3}$ connected in series. The ratio of the number of moles of $Ag$ , $Cu$ and $Al$ deposited is

By Faraday's second law, the same charge deposits amounts inversely proportional to the number of electrons needed per ion:

Ag X^{+}

needs 1,

Cu X^{2 +}

needs 2,

Al X^{3 +}

needs 3. Moles are in the ratio

1 : \frac{1}{2} : \frac{1}{3} = 6 : 3 : 2