Hydrogen and its compoundMedium
Question
Which compound does not dissolve in hot, dilute HNO3 ?
Options
A.HgS
B.PbS
C.CuS
D.CdS
Solution
HgS + HNO3(dil.) → No reaction
(It is dissolved in aqua-regia)
3HgS + 2HNO36HCl → 3HgCl2 + 2NO + 3S + 4H2O
Other sulphides form nitrates with dil. HNO3
MS + 2HNO3 → M(NO3)2 + H2S (M = Pb, Cu or Cd)
(It is dissolved in aqua-regia)
3HgS + 2HNO36HCl → 3HgCl2 + 2NO + 3S + 4H2O
Other sulphides form nitrates with dil. HNO3
MS + 2HNO3 → M(NO3)2 + H2S (M = Pb, Cu or Cd)
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