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Assertion: Boron has a smaller first ion...

Assertion: Boron has a smaller first ionisation enthalpy than beryllium.
Reason: The penetration of a `2s` electron to the nucleus is more than the `2p` electron, hence `2p` electorn is more shielded by the inner core of electrons than the 2s electrons.

A

(II), (III), and (IV)

B

(I), (II), and (IV)

C

(I), (II), and (III)

D

(I), (III)j, and (IV)

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Statement-1: Boron has a smaller first ionisation enthalpy than beryllium. Statement-2: The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.

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