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KVPY Sample Paper KVPY Stream-SX Model Paper-14

  • 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 Kw at\[90{}^\circ C={{10}^{-12}}\])

    A) \[2+\log 2\]                   

    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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