pBlock ElementsII 1 Question 46
46. The correct statement(s) about $\mathrm{O}_{3}$ is/are
(2013 Adv.)
(a) $\mathrm{O}-\mathrm{O}$ bond lengths are equal
(b) thermal decomposition of $\mathrm{O}_{3}$ is endothermic
(c) $\mathrm{O}_{3}$ is diamagnetic in nature
(d) $\mathrm{O}_{3}$ has a bent structure
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Solution:
- Plan Due to resonance, bond lengths between two atoms are equal. Species is said to be diamagnetic if all electrons are paired.
Process is endothermic if it takes place with absorption of heat.
bent molecule all electrons paired thus, diamagnetic
$$ 2 \mathrm{O}{3} \longrightarrow 3 \mathrm{O}{2} \underset{\text { Exothermic }}{\Delta H^{\circ}=-142 \mathrm{~kJ} \mathrm{~mol}^{-1}} $$
Thus, (b) is incorrect. (a, c, d) are correct.
