1.

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The first ionization enthalpy for oxygen is lower than that of nitrogen.Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion.In the light of the above statements, choose the correct answer from the options given below.(A) Both A and R are correct and R is the correct explanation of A.(B) Both A and R are correct but R is NOT the correct explanation of A.(C) A is correct but R is not correct. (D) A is not correct but R is correct

Answer»

(A) Both A and R are correct and R is the correct explanation of A.

Ionisation energy = N > O. In oxygen atom, 2 of the 4 2p electrons must occupy the same 2p orbital resulting in an increased electron electron-repulsion.



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