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Manipal Medical Manipal Medical Solved Paper-2009

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

    A)  44.8 L          

    B)  11.2 L

    C)  22.4 L           

    D)  5.6 L

    Correct Answer: D

    Solution :

     Equivalent mass of\[Al=\frac{27}{3}=9\] Equivalent mass of \[H=1\] \[\frac{{{W}_{Al}}}{{{W}_{{{H}_{2}}}}}=\frac{eq.\,mass\,of\,Al}{eq.\,mass\,of\,{{H}_{2}}}\] \[\frac{4.5}{{{W}_{{{H}_{2}}}}}=\frac{9}{1}\] \[{{W}_{{{H}_{2}}}}=0.5\,g\] \[\because \]2 g of\[{{H}_{2}}\]at STP occupy volume =22.4L \[\therefore \]0.5 g of\[{{H}_{2}}\]at STP will occupy volume \[=\frac{22.4\times 0.5}{2}\] \[=5.6L\]


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