Question

The same quantity of electricity is passed through $A{l}_2(S{O}_4{)}_3$ and $AgN{O}_3$ solution with platinum electrodes. If n number of Al atoms are deposited on the cathode, the number of Ag atoms deposited on the cathode will be:

• A. n
• B. 2n
• C. 3n
• D. n/2

Answer 1

The correct option is C 3n

1 F = 96500 C = 1 Eq of $A{l}^{3+}$ = 1 Eq of $A{g}^{⨁}$
$=\frac{1}{3}$ mol of $A{l}^{3+}\equiv \frac{1}{1}$ mol of $A{l}^{⨁}$
= 1 mol of $A{l}^{3+}$ = 3 mol of $A{g}^{⨁}$
= n atoms of $A{l}^{3+}$ = 3n atoms of $A{g}^{⨁}$