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Q.

Statement I Boron has a smaller first ionisation enthalpy than beryllium.Statement Il 2p-electron of boron is more shielded from the nucleus by the inner core of electrons.

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a

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

b

Both Statement I and Statement II are correct but Statement II is not correct explanation of Statement I

c

Statement I is correct but Statement II is incorrect

d

Statement I is incorrect but Statement II is correct.

answer is A.

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Detailed Solution

Boron has a smaller first ionisation enthalpy than beryllium because the 2p-electron of boron is more shielded from the nucleus by the inner core of electrons than the 2s-electrons of beryllium.
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