Which of the following is insoluble in dil. HNO_3 but dissolves in aqu – InterviewSolution

1.	Which of the following is insoluble in dil. HNO_3 but dissolves in aqua regia?
Answer» Hg S Pb S `Bi_2 S_3` `CuS`. SOLUTION :HgS dissolves in aqua regia but is insoluble in DIL . `HNO_3` `3 Hg S + 2 HNO_(3) + 6 HCL to 3 Hg Cl_2 +2 NO + 4 H_2 O + 3 S `

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