The chemical used as a 'fixer' in photography is

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answered Feb 28, 2022 by AvantikaJha (114k points)
selected Feb 28, 2022 by Kratikaathwar

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Correct Answer - Option 2 : Sodium thiosulphate

The answer is Sodium thiosulphate.

Sodium thiosulfate (sodium hyposulfite), Na₂S₂O₃, is used by photographers to fix developed negatives and prints.
It acts by dissolving the part of the silver salts coated onto film which remain unchanged by exposure to light.

Compound	Chemical Formula	Properties	Uses
Sodium sulphate	Na₂SO₄	White crystalline solid (powder)	Kraft paper, paperboard, glass and detergents
Ammonium persulphate	(NH₄)₂S₂O₈	Colourless salt, highly soluble in water, strong oxidizing agent	Polymer chemistry (as an etchant), cleaning and bleaching agent
Borax (tincal, sodium tetraborate decahydrate)	Na₂B₄O₇.10H₂O	A soft and light, colourless crystalline substance	Glass, ceramics industry, flux in welding and soldering, fertilizer additive, soap, a disinfectant, and a water softener