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  4. Standard enthalpies of formation of O3,CO2,NH3 and HI are 142.2, -393.2, -46.2 and +25.9 kJmol- 1 respectively. The order of their increasing stabilities will be

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Q. Standard enthalpies of formation of $O_{3},CO_{2},NH_{3}$ and HI are 142.2, -393.2, -46.2 and +25.9 $kJmol^{- 1}$ respectively. The order of their increasing stabilities will be

NTA AbhyasNTA Abhyas 2022

Solution:

(i) Exothermic compounds are more stable than endothermic compounds.
(ii) Greater is the amount of heat evolved in the formation of a compound, more will be its stability.