A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution of a...

WAEC 2022

A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution
of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain

A. SO\(_{4}\) \(^{2-}\) ions
B. SO\(_{3}\) \(^{2-}\) ions
C. NO\(_{3}\)- ions
D. CO\(_{3}\) \(^{2-}\)- ions

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Correct Answer: Option B

Explanation

A salt that forms a white precipitate (ppt) with BaCl2 and is soluble in HCl is a sulphite (SO3\(^{2-}\)) salt.

A salt that forms a white precipitate with BaCl₂ and is insoluble in HCl is a sulphate (SO₄²⁻), specifically a salt containing the sulfate anion, such as sodium sulfate (Na₂SO₄).

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