JAMB - Chemistry (1978 - No. 44)
A solid X when heated gives off a brown gas. If X is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solution, then X is
basic lead carbonate
lead (II) nitrate
sodium carbonate
zinc nitrate
sodium nitrate
Erläuterung
Lead nitrate reacts with ammonium hydroxide solution to form a white precipitate. This white precipitate does not dissolve in excess ammonium hydroxide.