A) \[HgS\]
B) \[CuS\]
C) \[B{{i}_{2}}{{S}_{3}}\]
D) \[PbS\]
Correct Answer: A
Solution :
Except\[HgS\], all other sulphides of second \[(IIA)\]group of qualitative analysis are soluble in dilute\[HN{{O}_{3}}\]but\[HgS\]is soluble only in aqua regia (a mixture of 3 part\[HCl\]and 1 part\[HN{{O}_{3}})\]. \[3HgS+\underbrace{2HN{{O}_{3}}+6HCl}_{aqua\,\,regia}\xrightarrow{{}}3HgC{{l}_{2}}\] \[+3S+2NO+4{{H}_{2}}O\]
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