Question

Which one of the following is an incorrect statement?

• A. $O_3$ oxidises PbS to $PbSO_4$
• 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

Answer 1

Answer: (D)

The two oxygen-oxygen bond lengths in $O_3$ are different

Answer 2

Ozone oxidises $PbS$ to $PbSO _{4}$ and $NO$ to $NO _{2}$. $PbS (s)+4 O _{3}(g) \longrightarrow PbSO _{4}(s)+4 O _{2}(g)$ $NO (g)+ O _{3}(g) \longrightarrow NO _{2}(g)+ O _{2}(g)$ It oxidises aqueous KI at $pH \,9.2$ and acts as oxidising agent in the manufacture of $KMnO _{4}$. It is a resonance hybrid of following two structures. That's why the two oxygen-oxgyen bond lengths in this molecule are identical.