A white precipitate was formed when BaCl2(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

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A. SO4 2− ions
B. SO3 2− ions
C. NO3− ions
D. SO3 2− ions

Correct Answer:

Option D – SO3 2− ions

Explanation

Effervescence is the formation of gas bubbles in a liquid by a chemical reaction. An example of effervescence is the release of carbon dioxide which bubbles as a gas from the liquid when limestone chips, which are composed of calcium carbonate, are added to dilute hydrochloric acid.

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