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JEE Main & Advanced JEE Main Paper (Held on 12-4-2019 Afternoon)

  • question_answer
    In comparison to boron, beryllium has : [JEE Main 12-4-2019 Afternoon]

    A) lesser nuclear charge and greater first ionisation enthalpy

    B) lesser nuclear charge and lesser first ionisation enthalpy

    C) greater nuclear charge and greater first ionisation enthalpy

    D) greater nuclear charge and lesser first ionisation enthalpy

    Correct Answer: A

    Solution :

    In case of 'Be' electron remove from '2s' orbital while in case of 'B' electron remove from '2p' orbital. '2s' orbital have greater penetration effect then '2p' orbitals. So 'Be' having more I.E. then 'B'


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