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NEET Sample Paper NEET Sample Test Paper-36

  • question_answer
    IF\[E_{F{{e}^{2+}}/Fe}^{o}=-0.441\,V\]and \[E_{F{{e}^{3+}}/F{{e}^{2+}}}^{o}=0.771\,V,\]the  standard emf of the reaction\[Fe+2F{{e}^{3+}}\xrightarrow{{}}3F{{e}^{2+}}\]will be

    A)  1.653V      

    B)  0.111 V

    C)  0.330V      

    D)  1.212V

    Correct Answer: D

    Solution :

     \[Fe\xrightarrow{{}}F{{e}^{2+}}+2{{e}^{-}}\] \[\Delta G_{1}^{o}=-2Fx.441\] \[2F{{e}^{3+}}+2{{e}^{-}}\xrightarrow{{}}F{{e}^{2+}}\]\[\Delta G_{2}^{o}=-2Fx.771\] \[Fe+2F{{e}^{3+}}\xrightarrow{{}}3F{{e}^{2+}}\]\[\Delta G_{3}^{o}=-2FE_{3}^{o}=\Delta G_{1}^{o}+\Delta G_{2}^{o}\]\[=-2Fx.441-2Fx.771\] \[E_{3}^{o}=1.212\,V\]


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