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J & K CET Engineering J and K - CET Engineering Solved Paper-2005

  • question_answer
    The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameter are connected in series and electric current is passed through for sometimes, \[1.6\text{ }g\]of copper is deposited. Then, the mass of silver deposited will be

    A)  \[3.5\text{ }g\]

    B)  \[2.8g\]

    C)   \[5.4\text{ }g\]

    D)  None of these

    Correct Answer: C

    Solution :

    From Faraday?s second law, if electric currents of same strength be allowed to flow in different electrolytes for the same time, then the masses of the substances liberated are directly proportional to their chemical equivalents. \[\therefore \] \[\frac{{{m}_{2}}}{{{m}_{1}}}=\frac{{{E}_{2}}}{{{E}_{1}}}\] \[\Rightarrow \] \[{{m}_{2}}=\frac{{{E}_{2}}}{{{E}_{1}}}.{{m}_{1}}\] Given,   \[{{E}_{2}}=108,\,\,\,{{E}_{1}}=32,\,\,\,\,{{m}_{1}}=1.6g\] \[\therefore \]\[{{m}_{2}}=\frac{108}{32}\times 1.6=5.4g\]


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