How many of the following substances are soluble in concentrated $H N O_{3}$ ?
$B a S O_{4}, C u S, P b S, H g S$

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Solution

The correct option is B 2
$B a S O_{4}$ is insoluble in concentrated $H N O_{3}$ because the $H^{+}$ ions of the acid cannot remove ${S O}_{4}^{2 -}$ ions from barium sulphate.

$C u S$ is soluble in concentrated $H N O_{3}$ , leaving a white precipitate of sulphur.
$C u S + 8 H N O_{3} \to C u S O_{4} + 8 N O_{2} + 4 H_{2} O$

$P b S$ is also soluble in concentrated $H N O_{3}$ . The reaction is as follows:
$3 P b S + 8 H N O_{3} \to 3 P b S O_{4} + 8 N O + 4 H_{2} O$

$H g S$ is insoluble in concentrated $H N O_{3}$ .

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