The chemical used as a fixer/developer in photography is _________.

Sodium sulphate

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Sodium sulphide

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Sodium thiosulphate

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Sodium sulphite

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Solution

The correct option is C Sodium thiosulphate
Photographic fixer is a mix of chemicals used in the final step in the photographic processing of film or paper. By fixation, the film or paper is insensitive to further action by light. Popular salts are sodium thiosulfate and ammonium thiosulfate.

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