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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-3

  • 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 :

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


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