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: First ionisation energy for nitrogen is lower than oxygen. Reason: Across a period effective nuclear charge decreases.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both 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.
Correct Answer: D
Solution :
In a group from left to right atomic number or nuclear charge or effective nuclear charge increase and size decrease, as a result ionization energy increase. But elements of DA and VA group on the account of their half-filled and completely filled orbitals respectively have stable configuration and so to remove electron from them comparatively larger energy has to be supplied. \[IA<IIA>IIIA<IVA<VA>VIA<VIIA\] The ionisation energy of N (VA) is more than O (VIA)
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