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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 41

  • question_answer
    An aqueous solution containing 1 M each of \[A{{u}^{+3}},C{{u}^{+2}},A{{g}^{+}},L{{i}^{+}}\] is being electrolyzed by using inert electrodes. The value of standard potentials are: \[E{{_{Ag}^{{}^\circ }}_{^{+}/Ag}}=0.80V,E_{C{{u}^{+}}/Cu}^{{}^\circ }=0.34V\] and  \[E{{_{Au}^{{}^\circ }}_{^{+3}/Au}}=1.50V,E_{L{{i}^{+}}/Li}^{{}^\circ }=-3.03V\] With increasing voltage, the sequence of deposition of metals on the cathode will be:

    A) Li, Cu, Ag, Au   

    B)        Cu, Ag, Au

    C) Au, Ag, Cu      

    D)        Au, Ag, Cu, Li

    Correct Answer: C

    Solution :

    [c] Only \[A{{u}^{+3}},A{{g}^{+}}\] and \[C{{u}^{+2}}\] will deposit at cathode. Li will not deposit at cathode because SRP of \[{{H}_{2}}\] is 0.00V, so after \[C{{u}^{+2}},{{H}_{2}}\] will evolve at cathode.


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