A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2016 · Q311 Mark
Photochromic lenses in spectacles darken in sunlight because silver crystals are produced by the reaction shown. Ag⁺ + Cl⁻ → Ag + Cl Which statements are correct for this reaction? 1 Both silver and chlorine atoms have an oxidation number of zero. 2 The oxidation number of chlorine increases. 3 Electrons are transferred from Cl⁻ ions to Ag⁺ ions.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct answer
A: 1, 2 and 3 are correct
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