Question

Which one of the following in an incorrect statement?

• A. $O_3$ oxidises $PbS$ to $PbS{O}_4$
• B. $O_3$ oxidises nitric oxide to nitrogen dioxide
• C. $O_3$ oxidises aqueous $KI$ at $pH=9.2$
• D. The two oxygen-oxygen bond lengths in $O_3$ are different
• E. $O_3$ is used as an oxidising agent in the manufacture of $KMn{O}_4$

Answer 1

The correct option is D The two oxygen-oxygen bond lengths in $O_3$ are different

Ozone oxidises $PbS$ to $PbS{O}_4$ and $NO$ to $N{O}_2$
$PbS\left(s\right)+4O_3\left(g\right)\to PbS{O}_4\left(s\right)+4O_2\left(g\right)$
$NO\left(g\right)+O_3\left(g\right)\to N{O}_2\left(g\right)+O_2\left(g\right)$
It oxidises aqueous $KI$ at $pH9.2$ and acts as oxidising agent in the manufacture of $KMn{O}_4$.
It is a resonance hybride of following two structures.
That's why the two oxygen-oxygen bond lengths in this molecule are identical.