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The chemical used as a fixer/developer in photography is

Options

  1. ASodium sulphate
  2. BSodium sulphide
  3. CSodium thiosulphate
  4. DSodium sulphite

Correct answer

C. Sodium thiosulphate

Step-by-step solution

Fixation is commonly achieved by treating the film or paper with a solution of thiosulfatesalt. Popular salts are sodium thiosulfate-commonly called hypo-and ammonium thiosulfate–commonly used in modern rapid fixer formulae.

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