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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Faraday's law of electrolysis

  • question_answer
    The atomic weight of \[Al\] is 27. When a current of 5 Faradays is passed through a solution of \[A{{l}^{+++}}\]ions, the weight of \[Al\] deposited is                                               [NCERT 1984]

    A)                 27 gm   

    B)                 36 gm

    C)                 45 gm   

    D)                 39 gm

    Correct Answer: C

    Solution :

               \[A{{l}^{3+}}+3{{e}^{-}}\to Al\]            \[{{E}_{Al}}=\frac{27}{3}=9\]                                 \[{{W}_{Al}}={{E}_{Al}}\times \text{No}\text{.}\,\text{of }\text{faradays}\]\[=9\times 5=45\,\,gm\].


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