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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
    pH of a solution produced when an aqueous solution of pH 6 is mixed with an equal volume of an aqueous solution of \[p{{H}_{3}}\] is about:                                 

    A) 4.5                   

    B) 4.0       

    C) 4.3                   

    D) 3.3

    Correct Answer: D

    Solution :

    [d] 3.3 In the final solution, \[[{{H}^{+}}]=({{10}^{-6}}+{{10}^{-3}})/2\]                                     \[=\frac{{{10}^{-3}}({{10}^{-3}}+1)}{2}\]                                     \[=\frac{1.00\times {{10}^{-3}}}{2}\]                                     \[=0.5005\times {{10}^{-3}}\]                                     \[=0.5005\times {{10}^{-4}}\]                                     \[PH=-\log [{{H}^{+}}]\]                                     \[=-\log (5.005\times {{10}^{-4}})\]                                     \[=4-0.6991\]                                         \[\simeq 3.3\]


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