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KVPY Sample Paper KVPY Stream-SX Model Paper-3

  • question_answer
    The cell \[Pt({{H}_{2}})(1\,atm)|{{H}^{+}}(pH=?)||.\]\[(a=1)|Ag\] has emf, \[{{E}_{298}}=0.\] The standard electrode potential for the reaction \[AgL+{{e}^{-}}\to \text{ }Ag+\overset{\Theta }{\mathop{I}}\,\] is \[-\,0.151\,A\] volt. Calculate the pH value-

    A) 3.37                             

    B) 5.26 

    C) 2.56                 

    D) 4.62

    Correct Answer: C

    Solution :

    [C] \[0=(-\,0.151-0)-\frac{0.0591}{1}\log \,[{{H}^{+}}].\] \[0.0591\,\,\times \,\,log\,[{{H}^{+}}]=-\,0.151\] \[pH=\frac{0.151}{0.0591}=\mathbf{2}\mathbf{.56}\]   


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