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Assertion: (A) Boron has a smaller first...

Assertion: (A) Boron has a smaller first ionsation enthalpy than beryllium.
Reason( R) The penetration of 2s electron to the nucleus is more than the 2p electron hence 2p elecrons 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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JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAIN-CHEMISTRY
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