Question : Which of the following is used in photography?
Option 1: Sodium bicarbonate
Option 2: Sodium thiosulphate
Option 3: Sodium hydroxide
Option 4: Sodium sulphate
Correct Answer: Sodium thiosulphate
Solution : The correct option is Sodium thiosulphate.
Sodium thiosulfate is used in photography as a fixing agent, especially in traditional film and darkroom processes. It is used to fix or stabilise the developed image on photographic paper by removing unexposed silver halide.
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