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CMC Medical CMC-Medical VELLORE Solved Paper-2012

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