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NEET AIPMT SOLVED PAPER SCREENING 2005

  • question_answer
                    4.5 g of aluminium (at. 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                 \[\frac{{{m}_{Al}}}{{{m}_{H}}}=\frac{{{E}_{Al}}}{{{E}_{H}}}\]                         \[\therefore \frac{4.5}{{{m}_{H}}}=\frac{27/3}{1}\]                         \[or{{m}_{H}}=0.5\,g\]                 \[\because \,2\,g\,{{H}_{2}}\,volume\,at\,STP=22.4\,L\]                 \[\therefore \,\,0.5\,g\,{{H}_{2}}\,volume\,\,at\,STP\]                 \[=\frac{22.4\times 0.5}{2}\,L=5.6\,L\]


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