MCQ
Tailing of mercury is $ .......... $ redox change.
- AIntramolecular.
- ✓Intermolecular.
- CDisproportion.
- DNone.
✓
Answer
Correct option: B.
Intermolecular.
When ozone is passed through mercury, mercurous oxide $\ce{(Hg_2O)}$ is formed.
Due to this, mercury loses its meniscus and starts sticking to the glass.
This phenomenon is known as Tailing of mercury.
$2 \mathrm{Hg}+\mathrm{O}_3 \rightarrow \mathrm{Hg}_2 \mathrm{O}+\mathrm{O}_2$.
In this reaction, the oxidation number of mercury changes from $0$ to $+1$. Thus, it is oxidized.
The oxidation number of oxygen changes from 0 to $-2$. Thus, it is reduced.
Due to this, mercury loses its meniscus and starts sticking to the glass.
This phenomenon is known as Tailing of mercury.
$2 \mathrm{Hg}+\mathrm{O}_3 \rightarrow \mathrm{Hg}_2 \mathrm{O}+\mathrm{O}_2$.
In this reaction, the oxidation number of mercury changes from $0$ to $+1$. Thus, it is oxidized.
The oxidation number of oxygen changes from 0 to $-2$. Thus, it is reduced.
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