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CMC Medical CMC-Medical VELLORE Solved Paper-2015

  • question_answer
    1L of buffer solution containing 0.01 M \[N{{H}_{4}}Cl\] and 0.1 M \[N{{H}_{4}}OH\] having \[\text{p}{{K}_{b}}\] of 5, has pH of

    A)  9                                            

    B)  6

    C)  10                                         

    D)  7

    E)  4

    Correct Answer: C

    Solution :

                    Since, buffer is of base, therefore formula used is \[pOH=p{{K}_{b}}+\log \frac{[salt]}{[base]}\]                 \[=5+\log \frac{0.01}{0.1}=5+\log {{10}^{-1}}\]                 \[=5-1=4\] \[pH=14-4=10\]


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