Photographic development is a chemical process where exposed silver halide is converted to metallic silver. This reaction is significantly faster for areas that received more light (exposed portions). The term "oxidation" used in Option C is chemically incorrect; the process is reduction of silver ions. However, the developer itself gets oxidized during this process.
In developing a Photographic Plate:
Asked in RPSC RAS Prelims 1995 · Topic: Food Preservation, Nutrition, Medicine, etc. (Chemistry of Soaps, Detergents, and Personal Care Products)
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Answer: C. The exposed portion oxidised most rapidly
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