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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
    \[0.1M\] solution of an acid ionises to the extent of 10% at room temperature. The concentration of hydroxyl ions in g/ion/L would be:

    A)  \[{{10}^{-2}}\]                   

    B)  \[{{10}^{-12}}\]

    C)  \[{{10}^{-11}}\]                 

    D)  \[{{10}^{-10}}\]

    Correct Answer: B

    Solution :

    \[[{{H}^{+}}]=C.\alpha =0.1\times 0.1=1\times {{10}^{-2}}\] \[\because \]     \[[{{H}^{+}}]\,[O{{H}^{-}}]={{K}_{w}}\] \[\therefore \]  \[[1\times {{10}^{-2}}]\,[O{{H}^{-}}]=1\times {{10}^{-14}}\]                 \[\,[O{{H}^{-}}]=\frac{1\times {{10}^{-14}}}{1\times {{10}^{-2}}}\]                 \[\,[O{{H}^{-}}]={{10}^{-12}}g/ion/L\]


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