JEE Main & Advanced Chemistry Equilibrium Question Bank Common ion effect, Isohydric solutions, Solubility product, Ionic product of water and salt hydrolysis

  • question_answer At \[{{90}^{o}}C\] pure water has \[[{{H}_{3}}{{O}^{+}}]={{10}^{-6}}\,M,\] the value of \[{{K}_{w}}\] at this temperature will be [IIT 1981; MNR 1990; CBSE PMT 1993;  UPSEAT 1999]

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

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

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

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

    Correct Answer: B

    Solution :

                    For pure water \[[{{H}^{+}}]=[O{{H}^{-}}]\],  \[\therefore \,{{K}_{w}}={{10}^{-12}}\]s

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