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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    A weak acid HX has the dissociation constant \[1\times {{10}^{-5}}M\]. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is                                                 [IIT JEE Screening 2004]

    A)                 0.0001%              

    B)                 0.01%

    C)                 0.1%     

    D)                 0.15%                

    Correct Answer: B

    Solution :

               \[{{X}^{-}}+{{H}_{2}}O\]⇌ \[HX+O{{H}^{-}}\]                    \[{{K}_{h}}=\frac{{{10}^{-14}}}{{{10}^{-5}}}\] so \[h=\sqrt{\frac{{{10}^{-9}}}{{{10}^{-1}}}}={{10}^{-4}}\]                    \[100\times {{10}^{-4}}={{10}^{-2}}\]                                 So,   0.01%.


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