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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • question_answer
    0.02 M monobasic acid dissociates 2% hence, \[pH\] of the solution is     [MH CET 2000]

    A)                 0.3979  

    B)                 1.3979

    C)                 1.699    

    D)                 3.3979

    Correct Answer: D

    Solution :

               \[[{{H}^{+}}]=\alpha .C\,\,=\frac{2}{100}\times .02\];          \[[{{H}^{+}}]=4\times {{10}^{-4}}\]M                                 \[pH=-\log \,\,[{{H}^{+}}]=4-\log \,\,4\];               \[pH=3.3979\]


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