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The reaction which is used in black and white photography is:
- A$2 KClO_{3}(s) \xrightarrow{\text{Heat}} 2 KCl(s) + 3 O_{2}(g)$
- B$CH_{4}(g) + Cl_{2}(g) \xrightarrow{\text{Sunlight}} CH_{3}Cl(g) + HCl(g)$
- C$2 NaCl(s) \xrightarrow{\text{Electric current}} 2 Na(s) + Cl_{2}(g)$
- D$2 AgBr(s) \xrightarrow{\text{Sunlight}} 2 Ag(s) + Br_{2}(g)$
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