A chemist keeps calcium carbonate, silver chloride, and lead nitrate exposed to sunlight. Which compound/s show/s a visible change?
Only silver chloride
Calcium carbonate (CaCO3) is a stable white solid at ordinary conditions and does not change in ordinary sunlight; it only decomposes on strong heating. Lead nitrate is also stable in sunlight at room temperature; it decomposes only on heating to give brown NO2 and lead oxide.
Silver chloride (AgCl) is a photosensitive salt. On exposure to sunlight it undergoes photochemical decomposition: 2AgCl → 2Ag + Cl2. The finely divided metallic silver formed turns the initially white solid greyish or violet, which is a clearly visible change. This property is the basis of traditional photographic films.
Hence, the answer is Only silver chloride.
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