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BCECE Engineering BCECE Engineering Solved Paper-2004

  • question_answer
    If \[p{{K}_{a}}\]values of four adds are given below at \[25{{\,}^{o}}C\]the strongest acid is:

    A) 2.0                         

    B)        2.5

    C) 3.0                         

    D)        4.0

    Correct Answer: A

    Solution :

    Key Idea:\[p{{K}_{a}}=-\log \,{{K}_{a}}\] \[\therefore \] Higher the value of \[p{{K}_{a}},\]weaker is the acid. Among given choices \[2.0,\,2.5,3.0\] and 4.0 the value 2.0 is lowest so this acid is strongest.


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