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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    Given pH of a solution A is 3 and it is mixed with another solution B having pH 2. If both are mixed, then resultant pH of the solution will be

    A)  2.3                             

    B)  1.9

    C)  4.3                             

    D)  5.1

    Correct Answer: B

    Solution :

    \[pH\,of\,A=3,\,pH\,of\,B=2\] \[As\,[{{H}^{+}}]={{10}^{-3}}M,\,[{{H}^{+}}]={{10}^{-2}}\,M\] Total \[[{{H}^{+}}]={{10}^{-3}}+{{10}^{-2}}={{10}^{-3}}+10\times {{10}^{-3}}\] \[=11\times {{10}^{-3}}\] So \[pH=-{{\log }_{10}}[{{H}^{+}}]=-\log (11\times {{10}^{-3}})\] \[=3-\log 11\] \[=3-1.04=1.96\] Hence, the correct option is [b].


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