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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Mock Test - Electrochemistry

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

    A) increase the E and shift equilibrium to the left

    B) lower the E and shift equilibrium to the right

    C) increase the E and shift equilibrium to the right

    D) lower the E and shift equilibrium to the left

    Correct Answer: C

    Solution :

    [c] \[Zn(s)+2{{H}^{+}}(aq)\rightleftharpoons Z{{n}^{2+}}(aq)+{{H}_{2}}(g)\] \[{{E}_{cell}}=E_{cell}^{o}-\frac{0.059}{2}\log \frac{[Z{{n}^{2+}}][{{H}_{2}}]}{{{[{{H}^{2}}]}^{2}}}\] Addition of \[{{H}_{2}}S{{O}_{4}}\]will increase \[[{{H}^{+}}]\]and \[{{E}_{cell}}\]will also increase and the equilibrium will shift towards right.


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