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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    4.5 g of aluminium (at. mass 27u) is deposited at cathode from \[A{{l}^{3+}}\]solution by 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            \[{{m}_{H}}=0.5\,g\] \[\because \]The volume of 2 g \[{{H}_{2}}\] at STP = 22.4 L \[\therefore \] The volume of 0.5 g Hz at STP \[=\frac{22.4\times 0.5}{2}L=5.6\,L\]


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