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

  • question_answer
    If  \[0.4\,gm\,\,NaOH\] is present in 1 litre solution, then its \[pH\] will be                             [CPMT 1985; BHU 1980]

    A)                 2             

    B)                 10

    C)                 11          

    D)                 12

    Correct Answer: D

    Solution :

               \[[NaOH]=\frac{0.4}{40}=0.01M;\,\,\,\,\,[O{{H}^{-}}]={{10}^{-2}}M\]                                 \[[{{H}^{+}}]={{10}^{-12}},\,\,pH=-\log [{{H}^{+}}]=12\]


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