The process that is NOT endothermic in nature is : (A) H(g) + e– H–(g) (B) Ar(g) + e– Ar–(g) (C) O–( — JEE Mains Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

H(g) + e–      exothermic H– (g) Heg = –72 KJ/mol O–(g) + e–        c endothermi O2– (g) Heg = +744 KJ/mol Ar(g) + e–        c endothermi Ar– (g) Heg = +96 KJ/mol Na(g)        c endothermi Na+ (g) + e– IE = 495.8 KJ/mol