Find out why white silver chloride turns grey in sunlight.

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Accepted Answer

Silver chloride is white but undergoes a photochemical decomposition on exposure to light. Photons excite electrons in the chloride lattice, causing electron transfer that reduces Ag+ to metallic silver and oxidizes Cl− to chlorine. The net reaction can be written as: $AgCl \xrightarrow{h
u} Ag + 	frac{1}{2}Cl_2$ (or $2AgCl \xrightarrow{h
u} 2Ag + Cl_2$). The finely divided metallic silver formed appears grey/black, causing the observed color change. This is a light-induced decomposition (a photoreduction), so option (3) is the best specific explanation (while it is also a redox process, (3) names the photochemical decomposition explicitly).

FINAL_ANSWER: c

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