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JIPMER Jipmer Medical Solved Paper-2007

  • question_answer
    4.5 g of aluminium (Atomic mass 27 amu) is deposited at cathode from \[A{{l}^{3+}}\] solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from \[{{H}^{+}}\] ions in solution by the same quantity of electric charge will be

    A)  22.4 L                                   

    B)  44.8 L

    C)  5.6 L                     

    D)         11.2 L

    Correct Answer: C

    Solution :

    From second law of Faraday \[\frac{{{m}_{Al}}}{{{m}_{H}}}=\frac{{{E}_{Al}}}{{{E}_{H}}}\] \[\therefore \]  \[\frac{4.5}{{{m}_{H}}}=\frac{27/3}{1}\] or            \[{{m}_{H}}=0.5\,g\] \[\because \] \[2g\,{{H}_{2}}\] volume at STP = 22.4 L \[\therefore \]\[0.5g\,{{H}_{2}}\] volume at STP \[=\frac{22.4\times 0.5}{2}L=5.6\,L\]


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