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

  • question_answer
    pH value of a solution, whose hydronium ion concentration is \[6.2\times {{10}^{-9}}mol/\,l,\] is               [AFMC 1999; AIIMS 2000]

    A)                 6.21       

    B)                 7.21

    C)                 7.75       

    D)                 8.21

    Correct Answer: D

    Solution :

               \[[{{H}_{3}}{{O}^{+}}]\] means \[[{{H}^{+}}]=6.2\times {{10}^{-9}}\,\,mol/l\]                                 \[pH=-\log \,(6.2\times {{10}^{-9}})=8.21\]


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