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NEET Sample Paper NEET Sample Test Paper-33

  • question_answer
    Concentration of \[N{{H}_{4}}Cl\] and \[N{{H}_{4}}OH\] in a buffer solution are in the ratio of \[1:10,\] \[{{K}_{b}}\]for \[N{{H}_{4}}OH\] is \[{{10}^{-10}}\]. The pH of the buffer is

    A)  4                  

    B)  5

    C)  9                  

    D)  11

    Correct Answer: B

    Solution :

    \[pOH=-\log {{K}_{b}}+{{\log }_{10}}\frac{N{{H}_{4}}Cl}{N{{H}_{4}}OH}\] \[=-\log {{10}^{-10}}+{{\log }_{10}}\left[ \frac{1}{10} \right]=10-1=9\] \[pH=14-pOH=5\]


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