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JEE Main2019Chemistry
Q.

In comparison to boron, berylium has 

  1. A

    Greater nuclear charge and lesser first ionisation enthalpy

  2. B

    Greater nuclear charge and greater first ionisation enthalpy

  3. C

    Lesser nuclear charge and greater first ionisation enthalpy

  4. D

    Lesser nuclear charge and lesser first ionisation enthalpy 

Solution

Nuclear charge B > Be

Ionisation energy Be > B

(due to ns2 outer electronic configuration)

Be = 1s2 2s2 (more stable)

B = 1s2 2s2 2p1

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