1.

Which of the following is insoluble in dil. HNO_2 but soluble in aqua regia?

Answer»

HGS
PbS
`Bi_(2)S_(3)`
CuS

Solution :HgS is INSOLUBLE in dil. `HNO_(3)` but soluble in aqua REGIA.
`3HgS +2HNO_(3) + 6HClto 3HgCl_(2)+2NO+4H_(2)O+5S`


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