JAMB Biology 2015 Objective — Question 2
Question 2 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.
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When a few drops of barium chloride is added to an unknown sample acidified with hydrochloric acid, a white precipitate insoluble in excess of the acid was obtained. The likely anion in the sample is
- A. SO₄²⁻Correct
- B. Cl⁻
- C. S²⁻
- D. CO₃²⁻
Explanation
A white precipitate that remains undisclosed (insoluble) even after adding excess HCl confirms the presence of SO₄²⁻, since CO₃²⁻ and SO₃²⁻ would dissolve with effervescence.
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