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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Be has completely filled stable $2 s^{2}$ orbital and thus Be has higher ionisation energy than B. 2s orbital has less energy then 2p orbital.
Thus, the Assertion is correct but Reason is incorrect.

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

The correct option is C Assertion is correct but Reason is incorrectBe has completely filled stable 2s2 orbital and thus Be has higher ionisation energy than B. 2s orbital has less energy then 2p orbital.Thus, the Assertion is correct but Reason is incorrect.

The correct option is C Assertion is correct but Reason is incorrect
Be has completely filled stable $2 s^{2}$ orbital and thus Be has higher ionisation energy than B. 2s orbital has less energy then 2p orbital.
Thus, the Assertion is correct but Reason is incorrect.