NEET Sample Paper NEET Sample Test Paper-16

  • question_answer 87) The pH of a \[{{10}^{-10}}\]molar solution of \[HCl\] in water is

    A)  6.0                

    B)  7.0                 

    C)       8                  

    D)       13                              

    Correct Answer: B

    Solution :

    Total concentration of \[{{\text{H}}^{\text{+}}}\]ions \[={{10}^{-10}}+H{{O}^{-7}}\] \[(HCl)\,\,\,({{H}_{2}}O)\] \[={{10}^{-10}}(1+{{10}^{3}})=1001\times {{10}^{-10}}.\] So, \[pH=-\log (1001\times {{10}^{-10}})\] \[=10-3\] \[=7\] Hence, the correct option is (b).

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