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JCECE Medical JCECE Medical Solved Paper-2004

  • question_answer
    If 100 kWh of energy is consumed at 33 V in a  copper voltameter, what is the mass of copper liberated? (Electrochemical equivalent of copper is\[0.33\times {{10}^{-6}}kg/C\])

    A) \[1\,mg\]

    B) \[3.6\,kg\]

    C)  \[3.3\,kg\]

    D) \[1\,kg\]

    Correct Answer: B

    Solution :

     From Faradays law of electrolysis \[m=zq\] where,\[z\]is electrochemical equivalent, and q is charge. Also, Energy per sec \[=qV.\] or            \[E=qV\] \[\Rightarrow \] \[q=\frac{E}{V}=\frac{3.6\times {{10}^{8}}}{33}\] ?(ii) From Eqs. (i) and (ii), we get \[m=\frac{0.33\times {{10}^{-6}}\times 3.6\times {{10}^{8}}}{33}=3.6\,kg\]


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