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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

Assertion is correct statement and reason is wrong statement.

B

Assertion and reason both are correct statements and reason is correct explanation of Assertion.

C

Assertion and reason both are wrong statements.

D

Assertion and wrong statements and reason is correct statements.

Text Solution

Verified by Experts

The correct Answer is:
A
c) Assertion and reasoni both are correct statements and reason is correct explanation for assertion.
Boron has a smaller first ionisation enthalpy than beryllium because the penetration of a 2s electron to the nucleus is more than the 2p- electrons. Hence, 2p electron is more shieleded by the inner core of electron than the 2s electron.
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