Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: The first ionisation enthalpy of Be is greater than that of B. Reason: 2p-orbtial is lower in energy than 2s-orbital.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:.
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:.
C) If Assertion: is true but Reason: is false.
D) If both Assertion: and Reason: are false.
Correct Answer: C
Solution :
Be has fully \[2{{s}^{2}}\] -orbital which gives a relatively more stable electronic configuration.
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