A-LevelChemistryGroup 179701/12 · Feb/Mar 2016 · Q141 Mark

Chlorine gas is widely used to treat contaminated water. Which species present in water when chlorine gas has been added is responsible for killing bacteria?

AClO₂⁻

BCl⁻

CHCl

DOCl⁻

✓ Correct answer

D: OCl⁻

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2016 Paper 1 Variant 2, question 14.

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