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
Explanation
Lead nitrate reacts with ammonium hydroxide solution to form a white precipitate. This white precipitate does not dissolve in excess ammonium hydroxide.
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