O-LevelChemistryAcids, Bases & Salts5070/11 · Oct/Nov 2011 · Q201 Mark

Ammonium sulfate and potassium sulfate are salts which can be found in fertilisers. A sample of a fertiliser is warmed with aqueous sodium hydroxide and a gas with pH 10 is given off. Which salt must be in the fertiliser and which gas is given off?

Asalt in fertiliser: ammonium sulfate; name of gas: ammonia

Bsalt in fertiliser: ammonium sulfate; name of gas: sulfur dioxide

Csalt in fertiliser: potassium sulfate; name of gas: ammonia

Dsalt in fertiliser: potassium sulfate; name of gas: sulfur dioxide

✓ Correct answer

A: salt in fertiliser: ammonium sulfate; name of gas: ammonia

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 2011 Paper 1 Variant 1, question 20.

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