Subject - Chemistry:

Basics

MCQ - 454-2640

Question:

As a fixing agent in photography, sodium thisoulphate is used for

Dissolving out unreacted silver bromide
Converting silver halides to metallic silver
Reducing solubility of AgBr
Converting silver halides to metallic silver

Correct Answer: A

Explanation:

An emulsion of sodium thiosulfate (called hypo by photographers) 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

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