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Q.

Tailing of Hg caused by ozone, is due to the formation of :

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a

Hg₂O

b

HgO₂

c

HgO

d

Hg₃O₂

answer is B.

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Detailed Solution

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When Ozone O3is passed through Mercury Hgit loses its meniscus and it begins sticking to the glass wall due to the formation of the Mercurous oxideHg₂O.
This phenomenon is known as the tailing of mercury.
$2 Hg (s) + O 3 (g) \to {Hg}_{2} O (s) + O_{2}$
Oxidation state of Hg is 0.
Oxidation state of Hg in Hg₂O is+1.
The Tailing of mercury indicates a change in the oxidation number of Mercury by one.
Shaking the walls of glass with water retrieves the lost meniscus.

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Tailing of Hg caused by ozone, is due to the formation of :