A white salt (P), turn black by reaction with NH3, forming the compound (Q), which is soluble in aqueous aqua-regia and gives compound (R). 'R' gives orange red precipitate with KI which is soluble in

Question

A white salt (P), turn black by reaction with NH3, forming the compound (Q), which is soluble in aqueous aqua-regia and gives compound (R). 'R' gives orange red precipitate with KI which is soluble in excess of KI, forms (S). S is used to test NH3 (g). What is 'P'?

Prashant Kotian · Accepted Answer

Correct answer: C.    2 2 3 2 Hg Cl NH HgNH Cl.Hg P Q Black   3 HNO / HCl   2 HgCl R     excess KI KI 2 4 2 K HgI HgI S Orange  

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