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JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

  • question_answer
    The standard potentials of\[A{{g}^{+}}/Ag,H{{g}_{2}}^{2+}/2Hg,\]\[C{{u}^{2+}}/Cu\] and \[M{{g}^{2+}}/Mg\] electrodes are 0.80,0.79, 0.34 and -2.37 V, respectively. An aqueous solution which contains one mole per litre of the salts of each of the four metals is electrolyzed. With increasing voltage, the correct sequence of deposition of the metals at the cathode is   JEE Main  Online Paper (Held On 19  May  2012)

    A) \[Ag,Hg,Cu,Mg\]             

    B)                        \[Cu,Hg,Ag\]only

    C)                        \[Ag,Hg,Cu\]only            

    D)                        \[Mg,Cu,Hg,Ag\]

    Correct Answer: C

    Solution :

                    More the reduction potential, more is the deposition of metals at cathode. Cation having \[{{E}^{0}}\]value less than - 0.83V (reduction potential of \[{{H}_{2}}O\]) will not  < deposit from aqueous solution. Hence correct order of A deposition of the metal at the cathode is  Ag > Hg > Cu


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