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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Electrode potential Ecell Nernst equation and ECS

  • question_answer
    In a cell that utilises the reaction \[Z{{n}_{(s)}}+2{{H}^{+}}(aq)\to \] \[Z{{n}^{2+}}(aq)+{{H}_{ 2(g)}}\]addition of \[{{H}_{2}}S{{O}_{4}}\] to cathode compartment, will                                     [AIEEE 2004]

    A) Increase the E and shift equilibrium to the right

    B) Lower the E and shift equilibrium to the right

    C) Lower the E and shift equilibrium to the left

    D) Increase the E and shift equilibrium to the left

    Correct Answer: A

    Solution :

    \[Z{{n}_{(s)}}+2{{H}^{+}}_{(aq)}\] ? \[Zn_{(aq)}^{2+}+{{H}_{2(g)}}\]                   \[{{E}_{Cell}}=E_{Cell}^{0}-\frac{.059}{2}\log \frac{[Z{{n}^{2+}}]}{{{[{{H}^{+}}]}^{2}}}\] When \[{{H}_{2}}S{{O}_{4}}\]is added then \[[{{H}^{+}}]\] will increase therefore \[{{E}_{Cell}}\]will also increases and equilibrium will shift towards right.


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