Analytical ChemistryHard
Question
A metal nitrate solution does not give white precipitate with concentrated hydrochloric acid but on dilution with water produces a white precipitate. The metal nitrate solution with K2CrO4 and Na2HPO4 reagents gives red and yellow precipitates respectively which are soluble in ammonia solution. The cation of the metal nitrate is :
Options
A.Pb2+
B.Ag+
C.Cu2+
D.Bi3+
Solution
Ag+ + 2Cl- → [AgCl2]- (soluble complex) ; Ag+ + Cl- (dilute HCl) → AgCl- (white)
2Ag+ + CrO42- → Ag2CrO4 ↓ (red) ; Ag2CrO4↓ + NH3 → 2[Ag(NH3)2]+ + CrO42-
3Ag+ + HPO42- → Ag3PO4 ↓ (yellow) + H+ ; Ag3 PO4 ↓ + 6NH3 → [Ag(NH3)2]+ + PO43-
2Ag+ + CrO42- → Ag2CrO4 ↓ (red) ; Ag2CrO4↓ + NH3 → 2[Ag(NH3)2]+ + CrO42-
3Ag+ + HPO42- → Ag3PO4 ↓ (yellow) + H+ ; Ag3 PO4 ↓ + 6NH3 → [Ag(NH3)2]+ + PO43-
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