MCQ
The following reaction is described as


- A${S_{{E^2}}}$
- B${S_{{N^1}}}$
- ✓${S_{{N^2}}}$
- D${S_{{N^0}}}$


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A current was passed for $10$ hours. $10.8\ g Ag$ was deposited at cathode in $(III)$ electrolytic cell during electrolysis if current efficiency is $50\%.$
If $Z_1,$ $Z_2$ and $Z_3$ be the electrochemical equivalent in the formation of $H_2, Cu$ and $Ag$ respectively, hence $Z_1 : Z_2 : Z_3$ would be
