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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    The pH value of the following half cell is _______ \[P{{t}_{{\scriptstyle{}^{{{H}_{2}}}/{}_{{{H}_{2}}S{{O}_{4}}}}}}\]. The electrode potential is\[-0.3V\].

    A)  \[5.08\]        

    B)  \[3\]

    C)  \[4\]                            

    D)  \[6\]    

    Correct Answer: A

    Solution :

        Electrode potential \[=-0.3\text{ }V\] The electrode reaction may be given as \[2{{H}^{+}}_{(aq)}+2{{e}^{-}}\xrightarrow{{}}{{H}_{2(g)}}\] \[E={{E}^{o}}-\frac{0.059}{2}\log \frac{1}{{{[{{H}^{+}}]}^{2}}}\] \[-0.3=0-\frac{0.059}{2}\left( -2\,\log \,\left[ {{H}^{+}} \right] \right)\] \[-0.3=-0.059\,pH\] \[pH=\frac{0.3}{0.059}\] \[pH=5.085\]             


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