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

  • question_answer
    When a rod of metal \[A\] is dipped in an aqueous solution of metal \[B\](concentration of \[{{B}^{2+}}\]ion being 1M) at \[{{25}^{o}}C\], the standard electrode potentials are \[{{A}^{2+}}/A\]=?0.76 volts, \[{{B}^{2+}}\]/B = + 0.34 volts [KCET 1992]

    A)                 \[A\] will gradually dissolve

    B)                 \[B\] will deposit on \[A\]

    C)                 No reaction will occur

    D)                 Water will decompose into \[{{H}_{2}}\] and \[{{O}_{2}}\]

    Correct Answer: B

    Solution :

               Since \[E_{{{A}^{2+}}/A}^{o}<E_{{{B}^{2+}}/B}^{o}\]. A has greater tendency to be oxidized.                                 \[A+{{B}^{2+}}\to {{A}^{2+}}+B\].


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