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KVPY Sample Paper KVPY Stream-SX Model Paper-12

  • question_answer
    Equal volume of two solution having pH = 2 and pH = 10 are mixed together at \[90{}^\circ C.\] Then pH of resulting solution is: \[(Take\,\,{{K}_{w}}\,at\,\,90{}^\circ C={{10}^{-12}})\]

    A) \[2+log\text{ }2\]

    B) \[10-log\,2\]

    C) 7

    D) 6

    Correct Answer: D

    Solution :

    Kw at \[90{}^\circ C\] is \[{{10}^{-12}}\] Hence, Neutral point is 6 So, on adding \[pH=2({{10}^{-2}}{{H}^{+}})\] and \[pH=10({{10}^{-2}}OH)\] Solution lead to the formation of neutral solution i.e. \[pH=6\]


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