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J & K CET Engineering J and K - CET Engineering Solved Paper-2004

  • question_answer
    The pH of a buffer solution of \[\text{0}\text{.1}\,\text{M}\,\text{N}{{\text{H}}_{\text{4}}}\text{OH}\]\[\text{ }\!\![\!\!\text{ p}{{\text{K}}_{b}}\text{=5}\text{.0 }\!\!]\!\!\text{ }\]and \[\text{0}\text{.01}\,\text{M}\,\text{N}{{\text{H}}_{\text{4}}}\text{Cl}\]is

    A)  1

    B)  4

    C)  10

    D)  13

    Correct Answer: C

    Solution :

    \[pOH=p{{K}_{b}}+\log \frac{[Salt]}{[Base]}\] \[=5+\log \frac{0.01}{0.1}\] \[pOH=5-1\] \[pOH=4\] \[pH+pOH=14\] \[pH=14-pOH\] \[=14-4\] \[pH=10\]


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