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KVPY Sample Paper KVPY Stream-SX Model Paper-19

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

    A) 3.37

    B) 5.26

    C) 2.56     

    D) 4.62

    Correct Answer: C

    Solution :

    \[0=(-\,0.151-0)-\frac{0.0591}{1}\log \,[{{H}^{+}}].\]
    \[0.0591\times \log \,[{{H}^{+}}]=-\,0.151\]
    \[pH=\frac{0.151}{0.0591}=2.56\]


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