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VMMC VMMC Medical Solved Paper-2006

  • question_answer
    At \[\text{90}{{\,}^{\text{o}}}\text{C,}\] pure water has \[{{\text{H}}_{\text{3}}}{{\text{O}}^{\text{+}}}\] ion concentration of \[{{10}^{-6}}\,\text{mol/}{{\text{L}}^{-1}}.\] The \[{{\text{K}}_{\text{w}}}\] at \[\text{90}{{\,}^{\text{o}}}\text{C}\] is:

    A)  \[{{10}^{-6}}\]                                 

    B)         \[{{10}^{-14}}\]                               

    C)         \[{{10}^{-12}}\]                               

    D)         \[{{10}^{-8}}\]

    Correct Answer: C

    Solution :

    \[{{K}_{w}}=[{{H}^{+}}][O{{H}^{-}}]\] \[=({{10}^{-6}})\times ({{10}^{-6}})\]    \[(\because \,[{{H}^{+}}]=[O{{H}^{-}}])\] \[={{10}^{-12}}\]


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