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NEET Sample Paper NEET Sample Test Paper-4

  • question_answer
    The mass of copper that will be deposited at cathode in electrolysis of \[0.2\text{ }M\] solution  when a quantity of electricity equal to that required to liberate \[2.24L\] of hydrogen from \[0.1\text{ }M\] aqueous \[{{H}_{2}}S{{O}_{4}}\] is passed (atomic mass of \[Cu=63.5\]).

    A)  \[1.59\,g\]                   

    B)  \[3.18\,g\]

    C)  \[6.35\text{ }g\]                     

    D)  \[12.70\text{ }g\]

    Correct Answer: C

    Solution :

    From faraday second law: \[\frac{{{m}_{cu}}}{{{m}_{{{H}_{2}}}}}=\frac{{{E}_{cu}}}{{{E}_{{{H}_{2}}}}}\] \[{{m}_{{{H}_{2}}}}=\frac{2}{22.4}\times 2.24=0.2g\] \[\frac{{{m}_{eu}}}{0.2}=\frac{{}^{63.5}/{}_{2}}{1}\] \[{{m}_{Cu}}=\frac{63.5\times 0.2}{2}=63.5\,g\]


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