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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2008

  • question_answer
    The negative Zn pole of Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 gin 30 min. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

    A)  0.180 g                                

    B)  0.141 g

    C)  0.126 g                

    D)         0.242 g

    Correct Answer: C

    Solution :

    According to Faradays law of electrolysis,                 \[m=zit\]                 \[\frac{{{m}_{Zn}}}{{{m}_{Cu}}}=\frac{{{z}_{Zn}}}{{{z}_{Cu}}}\] \[\therefore \]  \[\frac{0.13}{{{m}_{Cu}}}=\frac{32.5}{31.5}\]                 \[{{m}_{Cu}}=0.126\,\,g\]


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