54. The chemical name of 'Hypo' commonly used in photography is A.Sodium thiosulphate B.Silver nitrate C.Sodium nitrate D.Silver iodide
Answer: Option A Solution: 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 removed when the film is washed.
