Tailing of mercury is due to the formation of $HgO$

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$HgO$

$Hg - Na$

${Hg}_{2} O$

$HgO \cdot {HgCl}_{2}$

answer is B.

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Detailed Solution

Tailing of mercury means losing of the meniscus of mercury due to the formation of mercury oxide. This mercurous oxide sticks to the wall of the glass.

$O_{3} + 2 Hg \to {Hg}_{2} O + O_{2}$

It can be removed by hydrogen peroxide.

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