Standard enthalpies of formation of $O_{3}$ , ${C O}_{2}$ , ${N H}_{3}$ and $H I$ are 142.2, -393.2, -46.2 and +25.9 kJ ${m o l}^{- 1}$ respectively. The order of their increasing stabilities will be:

O_{3}

C O_{2}

{N H}_{3}

H I

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C O_{2}

{N H}_{3}

H I

O_{3}

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O_{3}

H I

{N H}_{3}

C O_{2}

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{N H}_{3}

H I

C O_{2}

O_{3}

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Solution

The correct option is B $C O_{2}$ , ${N H}_{3}$ , $H I$ , $O_{3}$
$e n t h a l p y \propto \frac{1}{s t a b i l i t y}$
as enthalpy increases stability decreases.
Order of stability: $C O_{2} > N H_{3} > H I > O_{3}$

Suggest Corrections

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