NEET Sample Paper NEET Sample Test Paper-14

  • question_answer 59) What is the\[[{{H}^{+}}]\]in a 0.40 M solution of \[HOCl,{{K}_{a}}=3.5\times {{10}^{-8}}\,M\]

    A) \[1.4\times {{10}^{-8}}M\]             

    B) \[1.2\times {{10}^{-4}}M\]

    C) \[1.9\times {{10}^{-4}}M\]             

    D) \[3.7\times {{10}^{-4}}M\]   

    Correct Answer: B

    Solution :

    \[\alpha =\sqrt{{{K}_{a}}V}\] \[{{K}_{a}}=3.5\times {{10}^{-8}},V=\frac{1}{0.40}L=2.5L.\] \[\alpha =\sqrt{3.5\times {{10}^{-8}}\times 2.5}\] \[=2.95\times {{10}^{-4}}\] \[[{{H}^{+}}]=\frac{\alpha }{V}=\frac{2.95\times {{10}^{-4}}}{2.5}=1.18\times {{10}^{-14}}\] \[\approx 1.2\times {{10}^{-4}}M\] Hence, the correct option is [b].

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