NEET Sample Paper NEET Sample Test Paper-32

  • question_answer 56) What is the \[O{{H}^{-}}\] concentration of an aqueous solution of a substance whose \[pH=3.2\]:-

    A)  \[{{10}^{-3.8}}\]               

    B)  \[{{10}^{-3.2}}\]

    C)  \[{{10}^{-10.8}}\]              

    D)  \[{{10}^{-10.2}}\]

    Correct Answer: C

    Solution :

    \[pH=3.2\Rightarrow pOH=14-3.2=10.8\] \[\Rightarrow \] \[-\log \,[O{{H}^{-}}]=10.8\] \[\Rightarrow \] \[\,[O{{H}^{-}}]={{10}^{-10.8}}\]

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