O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2023 · Q221 Mark

A solution of sodium carbonate is added to tap water. A white precipitate forms. Which ion present in the tap water causes the precipitate to form?

Achloride

Bmagnesium

Cpotassium

Dsulfate

✓ Correct answer

B: magnesium

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, Oct/Nov 2023 Paper 1 Variant 1, question 22.

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

A solution of fertiliser was tested as shown. Which ions must be present in the fertiliser?

Which calcium compound does not increase the pH of acidic soils?

The addition of dilute acid to a solution containing the anion Q and the subsequent use of limewater can be used to i…

Which pair of gases could be removed from the atmosphere using calcium carbonate?

In which parts of a motor car do the reactions, shown in the equations, take place?

The diagrams show four monomers. How many of these monomers would react with the molecule below to form a polymer?