Q.

The chemical used as a fixer in photography is -

A. sodium thiosulphate
B. sodium sulphate
C. borax
D. ammonium sulphate
Answer» A. sodium thiosulphate
Explanation: Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae.
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