Assertion (A): Conversion of Cl(g) into Cl– (g) is exothermic while the conversion of O(g) into O–2 (g) is endothermic.
Reason (R): Addition of 2nd e– to O– ion is endothermic due to repulsion between negative charge and e–.
(A) If both Assertion and reason are true and Reason is a correct explanation of Assertion.
(B) If both assertion and Reason are true but Reason is not a correct explanation of Assertion.
(C) If Assertion is true but Reason is false.
(D) If Assertion is false but reason is true.
