Which aqueous salt solution produces a white precipitate insoluble in dilute nitric acid upon addition of barium chloride?
Answer and explanation
Correct answer: C. Sodium sulfate
BaSO4 is insoluble in dilute mineral acids such as HNO3. While BaCO3, Ba3(PO4)2, and BaSO3 also precipitate with BaCl2, their precipitates readily dissolve in dilute nitric acid due to protonation of the weak-acid anions.
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