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VMMC VMMC Medical Solved Paper-2010

  • question_answer
    What is the pH value of \[{{10}^{-2}}\] molar \[\text{HN}{{\text{O}}_{\text{3}}}\] solution?

    A) 1                                             

    B) 2             

    C) 3                             

    D)        4

    Correct Answer: B

    Solution :

    \[\text{HN}{{\text{O}}_{\text{3}}}\] completely ionizes as \[HN{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{3}}{{O}^{+}}+NO_{3}^{-}\] \[\therefore \]  \[[{{H}_{3}}{{O}^{+}}]=HN{{O}_{3}}={{10}^{-2}}M\](given) \[pH=-=\log [{{H}_{3}}{{O}^{+}}]\] \[=-\log [{{10}^{-2}}]\] \[=-(-2\,log10)\] \[=2\]


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