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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    \[0.01\]mole of lime \[(CaO)\] was dissolved in \[100\text{ }c{{m}^{3}}\]of water. Assuming the base is completely ionized in the solution, the pH of the solution will be

    A)  \[13\]                         

    B)  \[13.3\]

    C)  \[12.3\]                       

    D)  \[12.0\]

    Correct Answer: B

    Solution :

    \[CaO+{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}\] \[[Ca{{(OH)}_{2}}]=0,.01\] mole/\[100C.C=0.1\,mol\,\,{{L}^{-1}}=0.1M\] Assuming complete ionization             \[[O{{H}^{-}}]=0.2M\]                 \[[{{H}^{+}}]=\frac{{{10}^{-14}}}{0.2}=5\times {{10}^{-14}}\]                 \[pH=-\log [{{H}^{+}}]\]                 \[=-\log \,\,(5\times {{10}^{-14}})\]                 \[=14-\log 5=14-0.699=13.3\]


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