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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Self Evaluation Test - Classification of Elements and Periodicity in Properties

  • question_answer
    Which of the following is not the correct order for the stated property?

    A) \[Ba>Sr>\]Mg; atomic radius

    B) \[F>O>N:\] first ionization enthalpy

    C) \[Cl>F>I;\] electron affinity

    D) \[O>Se>Te;\] electronegativity

    Correct Answer: B

    Solution :

    [b] On moving along the period, ionization enthalpy increases. In second period, the order of ionization enthalpy should be as follows : \[F>O>N\] But N has half-filled structure, therefore, it is more stable than O. That's why its ionization enthalpy is higher than O. Thus, the correct order of IE is \[F>N>O.\]


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