Home Chemistry D and F - Block Elements Compounds of Transitional elements In photography sodium thiosulphate is used as
Chemistry D and F - Block Elements Compounds of Transitional elements Single Correct MCQ
Published on: August 13, 2026

In photography sodium thiosulphate is used as

A
Complexing agent
B
Oxidising agent
C
Reducing agent
D
None of these

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Text Solution

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The correct answer is:
A

In order to make the image permanent, it is necessary to remove the unreduced silver bromide from the surface of the developed film. This operation is called fixing of image. Fixing is done by dipping the developed film or plate in sodium thiosulphate (hypo) solution. the hypo solution dissolves the unreduced silver bromide by forming a complex.

Thus sodium thiosulphate acts as a complexing agent.

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