A white precipitate will be formed if we add ammonia solution to:

Correct option is C

The correct answer is (C) AlCl₃ solution.

• When ammonia solution (NH₃) is added to AlCl₃ (Aluminum chloride), a white precipitate of Al(OH)₃ (aluminum hydroxide) is formed. This occurs because ammonia provides hydroxide ions (OH⁻), which react with aluminum ions (Al³⁺) in the solution.

AlCl3+3NH3+3H2O→Al(OH)3↓+3NH4Cl

Information Booster:

• Mg(NO₃)₂ solution: Does not form a precipitate with ammonia as magnesium hydroxide is only sparingly soluble.
• Ba(NO₃)₂ solution: Barium hydroxide is soluble in water, so no precipitate forms.
• KNO₃ solution: Potassium nitrate does not react with ammonia, as both potassium and nitrate ions are highly soluble.