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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    The commercial aluminium (trivalent : atomic weight 27) is generally obtained by electrolysis of \[AlC{{l}_{3}}\]. The charge required to deposit \[\text{13}\text{.5}\] gm of aluminium is

    A)  \[0.5\,\,F\]                

    B)         \[1.0\,\,F\]

    C)  \[1.5\,\,F\]                  

    D)         \[2.0\,\,F\]

    Correct Answer: C

    Solution :

     Chemical equivalent of\[Al=\frac{27}{3}=9\] So, the amount of electricity required to deposit the\[9gm\]of\[Al\](\[1gm.\]equivalent) is\[1F\]. The given amount \[13\cdot 5gm\] is \[9\times 1\cdot 5\] \[i.e.,\] the given amount contains \[1.5\,\,gm\] equivalent of\[Al\], so it will require \[1\cdot 5F\] of electricity.


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