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JEE Main & Advanced Sample Paper JEE Main Sample Paper-36

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

    A)  4                                

    B)  5

    C)  9                                

    D)  11

    Correct Answer: A

    Solution :

     \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\]\[=-\log {{10}^{-10}}+\log 1=10;pH=14-10=4\]


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