Multiple choice general knowledge

'hypo' solution used in photography actually is -

  1. sodium thiophosphate

  2. tetrasodium pyrophosphate

  3. potassium ferrocyanide

  4. sodium thiosulfate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

'Hypo' is the common name for sodium thiosulfate (Na2S2O3), used in photography as a fixing agent. During photographic development, it dissolves unexposed silver halide crystals from the film or paper, making the image permanent. The term comes from 'hyposulfite,' its outdated historical name.

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