O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2021 · Q231 Mark

Four test-tubes are set up as shown. What is the effect of adding dilute hydrochloric acid to each test-tube? (key: X = clear solution, ✓ = precipitate formed)

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AW: clear solution, X: precipitate formed, Y: clear solution, Z: precipitate formed

BW: precipitate formed, X: clear solution, Y: precipitate formed, Z: clear solution

CW: precipitate formed, X: clear solution, Y: precipitate formed, Z: precipitate formed

DW: precipitate formed, X: clear solution, Y: clear solution, Z: clear solution

✓ Correct answer

B: W: precipitate formed, X: clear solution, Y: precipitate formed, Z: clear solution

Oracle Prep sorts past-paper questions by topic, so you can drill Acids, Bases & Salts and see which topics are most likely to come up next.

Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 23.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content