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JEE Main & Advanced AIEEE Paper (Held On 11 May 2011)

  • question_answer
    An acid HA ionises as  \[HA\underset{{}}{\leftrightarrows}{{H}^{+}}+{{A}^{-}}\] The pH of 1.0 M solution is 5. Its dissociation constant would be:     AIEEE  Solved  Paper (Held On 11 May  2011)

    A)  5                 

    B) \[5\times {{10}^{-8}}\]

    C) \[1\times {{10}^{-5}}\]

    D) \[1\times {{10}^{-10}}\]

    Correct Answer: D

    Solution :

                    \[{{K}_{a}}=\frac{{{[{{H}^{+}})}^{2}}}{C-[{{H}^{+}})'}[{{H}^{+}}]<<C\] \[=\frac{{{({{10}^{-5}})}^{2}}}{1}={{10}^{-10}}\]


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