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Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    At \[{{90}^{o}}C\], pure water has \[{{H}_{3}}{{O}^{+}}\] ion concentration of \[{{10}^{-6}}\] mole\[litr{{e}^{-1}}\]. \[pOH\] of water at this temperature is:

    A)   \[8\]                                                  

    B)  \[6\]                                                

    C)   \[7.04\]

    D)  cannot be determined                  

    Correct Answer: C

    Solution :

                    At  \[{{90}^{o}}C,\]\[[{{H}_{3}}{{O}^{+}}]={{10}^{-6}}\,mol\,litr{{e}^{-1}}\] \[\therefore \]  \[[O{{H}^{-}}]={{10}^{-6}}\,mol\,\,litr{{e}^{-1}}\] hence,  \[pOH=-\log [O{{H}^{-}}]=6\]


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