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.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 77 in Chemistry-4-Compounds in above course in App.