Analytical ChemistryHard
Question
An aqueous solution of compound ′A′ gives white precipitate with 2M HCl. The precipitate becomes black on addition of aqueous NH3 due to formation of ′B′. ′B′ dissolves in aquaregia. ′A′ and ′B′ are :
Options
A.Hg2+ and Hg Cl2
B.Hg22+ and Hg2 Cl2
C.Hg2+ and Hg (NH2) Cl + Hg
D.Hg22+ and Hg (NH2) Cl + Hg
Hg2 Cl2 ↓ (white) 
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