First slide

Group16 or Oxygen family

Question

Which of the following statements about tailing of Hg is/ are correct?

Moderate

A

It is due to ${Hg}_{2} O$
B

It is due to $HgO$
C

It is removed by $H_{2} O_{2}$
D

It is removed by $O_{3}$

Solution

In tailing of Hg, it loses its meniscus and sticks to glass, due to solubility of Hg₂O in Hg, when Hg gets oxidised to ${Hg}_{2}^{2 +}$ by $O_{3}$ . It is removed by H₂O₂.
$\begin{matrix} 2 Hg + O_{3} ⟶ {Hg}_{2} O + O_{2} \\ {Hg}_{2} O + H_{2} O_{2} ⟶ 2 Hg + H_{2} O + O_{2} \end{matrix}$

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