Multiple choice

The chemical name of 'hypo', which is commonly used in photography is

  1. silver iodide

  2. silver cyanide

  3. sodium thiocyanide

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

Sodium thiosulphate (Na2S2O3) is commonly called 'hypo' in photography. It's used as a fixing agent to dissolve unexposed silver halide from photographic film or paper, making the image permanent.

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