A-LevelChemistryAnalytical techniques9701/12 · Oct/Nov 2025 · Q201 Mark

R is the aqueous solution of an ionic compound. • A white precipitate is formed when R is added to Sr(NO3)2(aq). • No visible reaction is seen when R is added to dilute HNO3(aq). What is the anion present in compound R?

ACl⁻

BSO4²⁻

CHCO3⁻

DCO3²⁻

✓ Correct answer

B: SO4²⁻

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Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2025 Paper 1 Variant 2, question 20.

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