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Which of the following is insoluble in dil. $HNO_3$ but soluble in aqua regia?

(a) HgS
(b) PbS
(c) $Bi_2S_3$
(d) CuS

1 Answer

Answer: HgS
 
HgS is insoluble in dil. $HNO_3$ but soluble in aqua regia.
$3HgS + 2HNO_3 + 6HCl \rightarrow 3HgCl_2 + 2NO + 4H_2O + 5S$
answered Feb 1, 2014 by mosymeow_1
 

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