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Why are silver chloride and silver bromide stored in dark-coloured bottles?

Answer and explanation

Correct answer: To prevent decomposition by light

Silver chloride and silver bromide are photosensitive salts. On exposure to light, they undergo photodecomposition and form metallic silver, for example: \(2\mathrm{AgCl}\xrightarrow{\text{light}}2\mathrm{Ag}+\mathrm{Cl}_2\). Dark-coloured bottles reduce exposure to light and therefore prevent this decomposition. This is not mainly to prevent thermal decomposition or oxidation by air.

Related tags

ScienceClass 10Chemical ReactionsPhotodecompositionSilver ChlorideSilver Bromide

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