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Assertion: The first ionisation energy o...

Assertion: The first ionisation energy of `Be` is greater than that of `B`.
Reason: 2p-orbital is lower in energy than 2s-orbital.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If the assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
A
The first Ionisation energy of `Be` is greater than Boron because it is difficult to remove electron from `Be` in comparison to boron. It is also true that the `2p`-orbitals. Both assertion and reason are true and reason is correct explanation.
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