The correct statement(s) about O_3 is (are)
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(C) . Due to resonance,the two $O-O$ bond lengths in $O_3$ are equal $(1.28 \ \mathring{A})$. This statement is correct.
$B$. The formation of $

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$A, C, D$

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(C) . Due to resonance,the two $O-O$ bond lengths in $O_3$ are equal $(1.28 \ \mathring{A})$. This statement is correct.
$B$. The formation of $O_3$ from $O_2$ is endothermic $(3O_2 ightarrow 2O_3, \Delta H = +142 \ 	ext{kJ/mol})$. Therefore,the decomposition of $O_3$ into $O_2$ is exothermic. This statement is incorrect.
$C$. In $O_3$,all electrons are paired,making it diamagnetic. This statement is correct.
$D$. $O_3$ has a bent structure with a bond angle of approximately $117^\circ$. This statement is correct.
Thus,the correct statements are $A, C, D$.

The correct statement$(s)$ about $O_3$ is (are)
$A$. $O-O$ bond lengths are equal.
$B$. Thermal decomposition of $O_3$ is endothermic.
$C$. $O_3$ is diamagnetic in nature.
$D$. $O_3$ has a bent structure.

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The correct statement$(s)$ about $O_3$ is (are) $A$. $O-O$ bond lengths are equal. $B$. Thermal decomposition of $O_3$ is endothermic. $C$. $O_3$ is diamagnetic in nature. $D$. $O_3$ has a bent structure.