Q. Which of the following chemicals is used in photography?
Answer: Silver bromide
Notes: Silver bromide (AgBr), a soft, pale-yellow, water insoluble salt well known (along with other silver halides) for its unusual sensitivity to light. It being sensitive to light, when suspended in gelatin, its grains create a photographic emulsion. When exposed to light, silver bromide decomposes producing a photo graphic impression on photo graphic film.

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