Question:

Which one of the following is an incorrect statement?

Updated On: Jul 12, 2022
  • $O_3$ oxidises PbS to $PbSO_4$
  • $O_3$ oxidises nitric oxide to nitrogen dioxide
  • $O_3$ oxidises aqueous KI at pH = 9.2
  • The two oxygen-oxygen bond lengths in $O_3$ are different
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The Correct Option is D

Solution and Explanation

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.
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Concepts Used:

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  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
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