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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 17

  • question_answer
    A 1.0 M solution with respect to each of metal halides \[A{{X}_{3}},B{{X}_{2}},C{{X}_{3}}\]and \[D{{X}_{2}}\]is electrolysed using platinum electrodes. If \[E_{{{A}^{3+}}/A}^{o}=1.50V,E_{{{B}^{2+}}/B}^{o}=0.34V,\] \[E_{{{C}^{3+}}/C}^{o}=-0.74V,E_{{{D}^{2+}}/D}^{o}=-2.37V,\]the correct sequence in which the various metals are deposited at the cathode, is

    A) A, B, C, D       

    B) D, C, B, A

    C) A, B, C            

    D) C, B, A

    Correct Answer: C

    Solution :

    [c] : The cations will be deposited as metals in the sequence of decreasing reduction potentials. Cations having \[E{}^\circ \]value \[<-0.83\text{ }V\](reduction potential of water) will not be deposited from aqueous solutions.


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