Question

In a $Cu$-voltameter, the mass deposited in $30s$ is ${}^{\prime }{m}^{\prime }$ $g$. If the time-current graph is shown in the following figure, what is the electrochemical equivalent of $Cu$?

• A. $\frac{m}{2}$
• B. $\frac{m}{3}$
• C. $\frac{m}{4}$
• D. $\frac{m}{63.5}$

Answer 1

The correct option is B $\frac{m}{3}$

Total charge passed:
$=\frac{1}{2}\times 100\times 10+100\times 10+100\times 10+\frac{1}{2}\times 100\times 10$
$=3\times 100\times 10mA\times s$
$=3000\times {10}^{-3}amps=3C$