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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
                    Find the pH value of the mixture containing \[50\text{ }c.c.\text{ }M-HCl\] and \[30\text{ }cc\text{ }M-NaOH\] solution assuming both to be completely ionised

    A)  \[0.7051\]                   

    B)  \[0.6021\]

    C)  \[10.051\]                   

    D)  \[8.052\]

    Correct Answer: B

    Solution :

    Total volume after mixing \[=50+30=80cc\] Molarity of \[HCl\] after mixing \[=\frac{50}{80}M\] Molarity of \[NaOH\] after mixing \[=\frac{30}{80}M\] Net molarity of \[HCl\] after mixing             \[=\frac{50}{80}-\frac{30}{80}=0.25M\]                 \[[{{H}^{+}}]=0.25=2.5\times {{10}^{-1}}\]                 \[pH=-\log [{{H}^{+}}]\]                 \[=-\log [2.5\times {{10}^{-1}}]\]                 \[=1-0.3979=0.6021\]


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