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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 38

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

    A) m/2      

    B)        m/3   

    C) m/4      

    D)        \[\frac{m}{63.5}\]

    Correct Answer: B

    Solution :

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


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