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JEE Main & Advanced JEE Main Paper (Held On 9 April 2017)

  • question_answer
    50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M \[HCl\]. If \[p{{K}_{b}}\] of ammonia solution is 4.75, the pH of the mixture will be: [JEE Online 09-04-2017]

    A)  8.25                      

    B)  9.25      

    C)  3.75                                      

    D)  4.75

    Correct Answer: D

    Solution :

    \[N{{H}_{3}}+HCl\xrightarrow{\,}\,N{{H}_{4}}Cl\] \[\frac{50\times 0.2}{1000}\,\,\,\,\frac{25\times 0.2}{1000}\] \[5\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,5\]               Buffer solution \[pOH=pkb\,\,N{{H}_{3}}+Hg\,+\frac{salt}{base}\,=4.75\]


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