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JCECE Engineering JCECE Engineering 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 Faraday's law of electrolysis                 \[m=zq\]                                                             ... (i) where, \[z\] is electrochemical equivalent, and \[q\] is charge. Also, Energy per\[\sec =qV\] or            \[E=qV\]                 \[q=\frac{E}{V}=\frac{3.6\times {{10}^{8}}}{33}\]                              ? (ii0 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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