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

  • question_answer
     The reaction \[Z{{n}^{2+}}+2{{e}^{-}}\to Zn\] has a standard potential of \[-0.76\,V\]. This means            [KCET 1992]

    A)                 \[Zn\] can't replace hydrogen from acids

    B)                 \[Zn\] is a reducing agent

    C)                 \[Zn\] is a oxidising agent

    D)                 \[Z{{n}^{2+}}\]is a reducing agent

    Correct Answer: B

    Solution :

                    Since \[E_{Z{{n}^{++}}/Zn}^{o}\] is negative, so Zn has greater tendency to be oxidized than hydrogen. Hence it can act as reducing agent.


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