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

  • question_answer
    The electrolytic cells, one containing acidified ferrous chloride and another acidified ferric chloride are connected in series. The ratio of iron deposited at cathodes in the two cells when electricity is passed through the cells will be [CPMT 1989]

    A)                 3 : 1       

    B)                 2 : 1

    C)                 1 : 1       

    D)                 3 : 2

    Correct Answer: D

    Solution :

               At cathode;            \[F{{e}^{2+}}+2{{e}^{-}}\to Fe\] ; \[F{{e}^{3+}}+3{{e}^{-}}\to Fe\] \[{{({{E}_{Fe}})}_{1}}=\frac{\text{Atomic}\text{.weight}}{2};\,\,{{({{E}_{Fe}})}_{2}}=\frac{\text{Atomic}\text{.weight}}{3}\]            Ratio of weight of Fe liberated                                 \[=\frac{\text{Atomic weight}}{3}:\,\frac{\text{Atomic weight}}{2}=\,3\,\,:\,\,2\].


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