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

  • question_answer
    The standard reduction potential for \[F{{e}^{2+}}/Fe\] and \[S{{n}^{2+}}/Sn\] electrodes are \[-0.44\] and \[-0.14\] volt respectively. For the given cell reaction \[F{{e}^{2+}}+Sn\,\to Fe+S{{n}^{2+}}\], the standard EMF is              [IIT Screening 1990; MP PMT 2003]

    A)                 + 0.30 V               

    B)                 ? 0.58 V

    C)                 + 0.58 V               

    D)                 ? 0.30 V

    Correct Answer: D

    Solution :

               For the cell reaction, Fe acts as cathode and Sn as anode. Hence,            \[E_{cell}^{o}=E_{\text{cathode}}^{o}-E_{\text{anode}}^{o}\]= ? 0.44 ? (? 0.14)= ? 0.30V                                 The negative EMF suggests that the reaction goes spontaneously in reversed direction.


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