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KVPY Sample Paper KVPY Stream-SX Model Paper-8

  • question_answer
    In the cell \[Pt(s)/{{H}_{2}}(g,1bar)/HCl(aq)/AgCl(s)/\] \[Ag(s)/pt(s)\] the cell potential is \[0.92V\] when a \[{{10}^{-6}}\]molal \[HCl\] solution is used. The standard electrode potential of \[(AgCl/Ag,C{{l}^{-}})\] electrode is: \[\left\{ Given,\frac{2.303RT}{F}=0.06V\,at298K \right\}\]

    A) \[0.94V\]                       

    B) \[0.76V\]

    C) \[0.40V\]                       

    D) \[0.20V\]

    Correct Answer: D

    Solution :

    \[E=E{}^\circ -0.06\log \frac{[{{H}^{+}}]\left[ C{{l}^{-}} \right]}{{{[{{H}_{2}}]}^{1/2}}}\] \[0.92=E{}^\circ -0.06\log \frac{{{10}^{-6}}{{.10}^{-6}}}{{{1}^{1/2}}}\] \[0.92=E{}^\circ -0.06\log {{10}^{-12}}\] \[=E{}^\circ -0.06\times 12\] \[E{}^\circ =0.92-0.06\times 12\] \[E{}^\circ =0.92-0.72\] \[\frac{E_{Ag}^{o}}{AgCl}=0.20.\]


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