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What is the main reason for storing silver chloride in a dark-coloured bottle?

Answer and explanation

Correct answer: To prevent decomposition caused by light

Silver chloride is photosensitive. In sunlight, it undergoes photodecomposition to form silver and chlorine:
\[2\mathrm{AgCl}(s)\xrightarrow{\text{sunlight}}2\mathrm{Ag}(s)+\mathrm{Cl_2}(g)\]
A dark-coloured bottle reduces exposure to light and therefore helps prevent this decomposition. Option B refers to thermal decomposition, whereas light is the cause of decomposition in this case.

Related tags

ScienceClass10Chemical-ReactionsPhotodecompositionSilver-ChlorideLight-Sensitive-Compounds

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