NEET Sample Paper NEET Sample Test Paper-39

  • question_answer 71) Solution of \[0.1\,N\,N{{H}_{4}}OH\]and \[0.1\,N\,N{{H}_{4}}Cl\]has pH 9.25, then find out \[p{{K}_{b}}\]of \[N{{H}_{4}}OH.\]

    A)  9.25         

    B)  4.75

    C)  3.75         

    D)  8.25

    Correct Answer: B

    Solution :

     Solution of \[N{{H}_{4}}OH\]and \[N{{H}_{4}}Cl\]acts as a basic buffer solution. For basic buffer solution \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[Base]}\] \[pOH=14-pH=14-9.25=4.75\] \[4.75=p{{K}_{a}}+\log \frac{0.1}{0.1}\] \[p{{K}_{a}}=4.75\]

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