Standard enthalpies of formation of $O_{3}, {C O}_{2}, {N H}_{3}, H I$ are $142.2, - 393.2, - 46.2, + 25.9$ $k J {m o l}^{- 1}$ 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 C $O_{3}, H I, {N H}_{3}, {C O}_{2}$
Enthalpy of formation $α$ stability.
The increasing order of enthalpy of formation is :
$O_{3} > H I > {N H}_{3} > {C O}_{2}$
$∴$ The increasing order of stabilities is :
$O_{3} > H I > {N H}_{3} > {C O}_{2}$

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