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

  • question_answer
    A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf of 2.7 volts. If the standard reduction potential of copper electrode is + 0.34 volt that of magnesium electrode is       [KCET 1989]

    A)                 + 3.04 volts        

    B)                 ? 3.04 volts

    C)                 + 2.36  volts

    D)                 ? 2.36 volts

    Correct Answer: D

    Solution :

               Mg lies above Cu in electrochemical series and hence Cu electrode acts as cathode                 \[E_{cell}^{o}=E_{C{{u}^{++}}/Cu}^{o}-E_{M{{g}^{++}}/Mg}^{o}\]           \[2.70\,\,V=0.34-E_{M{{g}^{++}}/Mg}^{o}\]; \[E_{M{{g}^{++}}/Mg}^{o}=-2.36\,\,V\].


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