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When aqua regia dissolves HgS, the function of the HCl in the mixture is to

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a

oxidize the sulphur

b

oxidize the mercury

c

complex the sulphur

d

complex the mercury

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detailed solution

Correct option is D

Aqua regia functions as both an oxidising and a complexing agent while dissolving HgS. The ${NO}_{3}^{-}$ ions oxidise the ${S^{2}}^{-}$ ions to free sulphur and the Cl ions to soluble complex-ions, ${HgCl}_{4}^{2 -}$ , in the presence of hydronium ions.

$3 {HgS}_{S} + 2 {NO}_{3}^{-} + 8 H_{3} O^{+} + 12 {Cl}^{-} \to 3 {HgCl}_{4}^{2 -} + 2 NO + 3 S + 12 H_{2} O$

Thus, When aqua regia dissolves HgS, the function of the HCl in the mixture is to complex the mercury.

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