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Assertion: Ionisation potential of Be (a...

Assertion: Ionisation potential of `Be` (atomic no.4) is less than `B` (atomic no.5).
Reason: The first electron released from `Be` is of p-orbital but that from `B` is of s-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 both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
`Be(Z=4), Is^(2),2S^(2)`
`B(Z=5), iS^(2),2s^(2),2p^(1)`
Ionisation potential of `Be` is greater than that of `B` as first electron released from `Be` is from `s-`orbital while it is from p-orbital in `B`.
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Knowledge Check

  • An electronic transition from 1s orbital of an atom causes

    A
    Absorption of energy
    B
    Release of energy
    C
    Both release or absorption of energy
    D
    Unpredictable

  • 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.

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    A
    27.2 eV
    B
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    C
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    D
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