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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2007

  • question_answer
        Consider the following\[E{}^\circ \]values \[E_{F{{e}^{3+}}/F{{e}^{2+}}}^{o}=+0.77\,V\] \[E_{S{{n}^{2+}}/Sn}^{o}=-0.14\,V\] Under standard conditions the potential for the reaction \[Sn(s)+2F{{e}^{3+}}(aq)\to 2F{{e}^{2+}}(aq)+S{{n}^{2+}}(aq)\]is

    A)  1.68V                                   

    B)  1.40V

    C)  0.91V                                   

    D)  0.63V

    Correct Answer: C

    Solution :

                    \[Sn(s)+2F{{e}^{3+}}(aq)\xrightarrow[{}]{{}}2F{{e}^{2+}}(aq)+S{{n}^{2+}}(aq)\] \[E_{cell}^{o}=E_{ox}^{o}+E_{red}^{o}\] \[=E_{Sn/S{{n}^{2+}}}^{o}+E_{F{{e}^{3}}/F{{e}^{2+}}}^{o}\] Given       \[E_{S{{n}^{2+}}/Sn}^{o}=-0.14\] \[\therefore \]  \[E_{Sn/S{{n}^{2+}}}^{o}=+0.14V\]                 \[E_{F{{e}^{3+}}/F{{e}^{2+}}}^{o}=0.77V\] \[\therefore \]  \[E_{cell}^{o}=0.14+0.77=0.91V\]


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