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NEET Sample Paper NEET Sample Test Paper-74

  • question_answer
    pH of 0.5 M aqueous solution of \[\operatorname{HF}\,\,({{K}_{\alpha }}=2\times 1{{0}^{-\,4}})\] is

    A)  2                                

    B)  4

    C)  6                                

    D)  10

    Correct Answer: A

    Solution :

    \[[{{H}^{+}}]\,\,=\,\,\sqrt{C{{K}_{a}}}\,\,=\,\,\sqrt{0.5\times 0.2\times 1{{0}^{-\,4}}}=\,\,\sqrt{1.0}\times 1{{0}^{-\,2}}\] \[\left[ {{H}^{+}} \right]=1{{0}^{-}}^{2}\] \[pH =-log\left[ {{H}^{+}} \right]=-log\left( 1{{0}^{-}}^{2} \right)=+2\]


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