A solution of a salt X reacts with AgNO₃ solution to give white precipitate which dissolves in excess aqueous ammonia. X contains

farouk2026

2 months ago

The correct answer is A. Cl-. Here's why:

AgNO3 reaction: Silver nitrate (AgNO3) reacts with chloride ions (Cl-) to form silver chloride (AgCl), which is a white precipitate.
Dissolving in ammonia: Silver chloride is unique in that it dissolves in excess aqueous ammonia due to the formation of a complex ion, diamminesilver(I) ([Ag(NH3)2]+).
The other options do not form precipitates with AgNO3 that dissolve in excess ammonia:

Pb2+ forms PbCl2, which is also a white precipitate, but it dissolves in hot water, not ammonia.
SO42- forms Ag2SO4, which is only slightly soluble in water and doesn't readily dissolve in ammonia.
Zn2+ doesn't typically form a precipitate with AgNO3.