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WB JEE Medical WB JEE Medical Solved Paper-2010

  • question_answer
    0.1 M HCl and \[\text{0}\text{.1 M }{{\text{H}}_{\text{2}}}\text{SO4}\]each of volume 2  mL are mixed and the volume is made upto 6 mL by adding 2 mL of 0.01 N NaCI solution. The pH of the resulting mixture is

    A)  1.17                                      

    B)  1.0

    C)  0.3                                        

    D)  log 2-log 3

    Correct Answer: B

    Solution :

                     Millimoles of \[{{H}^{+}}=0.1\times 2+0.1\times 2\times 2=0.6\] Total volume in mL = 6 \[pH=-{{\log }_{10}}[{{H}^{+}}]=-\log \left( \frac{0.6}{6} \right)=-\log 0.1=1\]


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