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WB JEE Medical WB JEE Medical Solved Paper-2006

  • question_answer
    0.005 M acid solution has 5 pH. The percentage ionisation of acid is :

    A)  0.8%                    

    B)  0.6%

    C)  0.4%                    

    D)  0.2%

    Correct Answer: D

    Solution :

                     We know that \[[{{H}^{+}}]={{10}^{-pH}}={{10}^{-5}}\] \[\alpha =\frac{\text{actual}\,\text{concentration}}{\text{molar}\,\text{concentration}}\] \[=\frac{{{10}^{-5}}}{0.005}=0.2\times {{10}^{-2}}\] \[\therefore \] percentage ionisation \[=0.2\times {{10}^{-2}}\times 100\]                                                 \[=0.2%\]


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