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NEET Chemistry Metallurgy / धातुकर्म Question Bank Self Evaluation Test - General Principals and Process of Isolation of Elements

  • question_answer
    When \[CuS{{O}_{4}}\] is electrolysed using platinum electrodes,

    A) copper is liberated at cathode, sulphur at  anode

    B) copper is liberated at cathode, oxygen at anode

    C) sulphur is liberated at cathode; oxygen anode

    D) oxygen is liberated at cathode, copper at anode

    Correct Answer: B

    Solution :

    [b] \[CuS{{O}_{4}}\rightleftharpoons C{{u}^{2+}}+SO_{4}^{2-}\] \[{{H}_{2}}O\rightleftharpoons {{H}^{+}}+O{{H}^{-}}\] At cathode: \[C{{u}^{2+}}+2{{e}^{-}}\to Cu\] At anode: \[4O{{H}^{-}}\to 2{{H}_{2}}O+{{O}_{2}}+4{{e}^{-}}~\]


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