Identify oxidizing and reducing agents in the following reactions.
Tailing of mercury

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Solution

Tailing of mercury is the reaction of mercury with ozone due to which Hg loses its meniscus and forms a mercurous oxide.
$2 H g O + O_{3} \to H g_{2} O + 2 O_{2}$
Hg act as reducing agent as Hg undergoes oxidation.
$O_{3}$ act as oxidizing agent as $O_{3}$ undergoes reduction.

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