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  4. When copper sulphate solution is electrolysed in a copper voltameter for 30 sec, then m gram of copper was deposited. Time current graph for the electrolysis is <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-auwluttk5fj9gr44.jpg /> The electrochemical equivalent of copper from above plot will be

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Q. When copper sulphate solution is electrolysed in a copper voltameter for 30 sec, then m gram of copper was deposited. Time current graph for the electrolysis is
Question
The electrochemical equivalent of copper from above plot will be

NTA AbhyasNTA Abhyas 2022

Solution:

By Faraday's law of electrolysis:
m = ZIt
$Z=\frac{m}{I t}$
It = Total charge passed through copper volta meter
= Area under the curve
$=\left(100 \times 10 \times 1 0^{- 3}\right)+2\left(\frac{1}{2} \times 10 \times 100 \times 1 0^{- 3}\right)=2$
So $Z=\frac{m}{2}$