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

  • question_answer
    The dissociation of water at \[{{25}^{o}}C\]is \[1.9\times {{10}^{-7}}%\] and the density of water is \[1.0\,g/c{{m}^{3}}.\] The ionisation constant of water is           [IIT 1995]

    A)                 \[3.42\times {{10}^{-6}}\]            

    B)                 \[3.42\times {{10}^{-8}}\]

    C)                 \[1.00\times {{10}^{-14}}\]         

    D)                 \[2.00\times {{10}^{-16}}\]

    Correct Answer: D

    Solution :

               \[\alpha =1.9\times {{10}^{-9}}\];  \[C=\frac{1000}{18}\]                    \[K=\frac{[{{H}^{+}}]\,\,[O{{H}^{-}}]}{({{H}_{2}}O)}=C{{\alpha }^{2}}\]                                 \[=1.9\times {{10}^{-9}}\times 1.9\times {{10}^{-9}}\times \frac{1000}{18}\]\[=2.0\times {{10}^{-16}}\].


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