Multiple choice

The chemical used as a fixer in photography is

  1. sodium carbonate

  2. borax

  3. sodium thiosulphate

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium thiosulphate is commonly known as 'hypo' and is used in photography to dissolve unexposed silver halides from the film or paper, thus fixing the image.

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