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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2010

  • question_answer
    Generally, the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is

    A) N and O               

    B) Na and Mg

    C) Mg and Al           

    D) Be and B

    Correct Answer: B

    Solution :

    Na belongs to IA group and Mg belongs to IIA group. On moving form left to right in a period, first ionization energy increases, thus, IE of Mg is greater than the IE of Na.                 IE order Mg > Na


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