WAEC Chemistry 2022 Objective — Question 17
Question 17 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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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
- A. SO4²⁻ ions
- B. SO3²⁻ ions
- C. NO3⁻ ions
- D. CO3²⁻ ionsCorrect
Explanation
A precipitate that dissolves in dilute HCl with rapid effervescence (releasing CO2 gas) indicates the presence of CO3²⁻ (carbonate) ions.
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