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J & K CET Engineering J and K - CET Engineering Solved Paper-2004

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

    A) \[{{10}^{-6}}\]         

    B) \[{{10}^{-8}}\]

    C) \[{{10}^{-12}}\]         

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

    Correct Answer: C

    Solution :

     In pure water: \[[{{H}^{+}}]=[O{{H}^{-}}]\] \[{{K}_{w}}=[{{H}^{+}}][O{{H}^{-}}]\] \[{{K}_{w}}={{10}^{-6}}\times {{10}^{-6}}={{10}^{-12}}\]


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