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  4. In a Cu-voltameter, mass deposited in 30s is m gm. If the time-current graph is shown in the following figure <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-4dvwxcfc6jymuss9.jpg /> What is the electrochemical equivalent of Cu?

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Q. In a $Cu$-voltameter, mass deposited in $30s$ is $m \,gm$. If the time-current graph is shown in the following figure
Question
What is the electrochemical equivalent of $Cu$?

NTA AbhyasNTA Abhyas 2022

Solution:

Total charge passed in $30$ sec.
$=\frac{1}{2}\times 100\times 10+100\times 10+100\times 10+\frac{1}{2}\times 100\times 10$
$=3\times 100\times 10mA\times s$
$=3000\times 10^{- 3}amp\text{ s}=\text{3C}$
$W=ZQ$
So $Z=\frac{W}{Q}=\frac{m}{3}$