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Q. The chemical name of ‘‘Hypo’’ commonly used in photography is:
Answer: Sodium thiosulphate
Notes: An emulsion of sodium thiosulfate is called hypo by photographers. It is used to stop development of exposed film. Thiosulfate converts undeveloped silver bromide grains in the film into water-soluble silver thiosulfate complexes that can be easily removed when the film is washed.

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