A-LevelChemistryGroup 179701/12 · Feb/Mar 2021 · Q161 Mark

Chlorine gas is reacted with aqueous sodium hydroxide. The oxidation number of chlorine changes from 0 to –1 and also from 0 to +1. Under which conditions does this reaction occur and what is the colour of the solid silver salt with chlorine in the oxidation state –1? reaction conditions colour of silver salt A cold, dilute alkali white B cold, dilute alkali yellow C hot, concentrated alkali white D hot, concentrated alkali yellow

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Acold, dilute alkali, white

Bcold, dilute alkali, yellow

Chot, concentrated alkali, white

Dhot, concentrated alkali, yellow

✓ Correct answer

A: cold, dilute alkali, white

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Topic: Group 17, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 16.

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