O-LevelChemistryAcids, Bases & Salts5070/12 · Oct/Nov 2020 · Q221 Mark

When water is liquid, it ionises slightly. H2O(l) ⇌ H+(aq) + OH–(aq) The forward reaction is endothermic. When the temperature of water is increased, which changes take place? 1 The water becomes acidic. 2 The water becomes alkaline. 3 More water molecules form ions.

A1 and 3

B1 only

C2 and 3

D3 only

✓ Correct answer

D: 3 only

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 22.

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