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Which of the following compounds is employed in photography?

1. Sodium sulfite (Na2SO3)
2. Sodium persulfate (Na2S2O8)
3. Sodium thiosulfate (Na2S2O3)
4. Sodium dithionite (Na2S2O4)

Correct answer: Sodium thiosulfate (Na2S2O3)

Solution

Sodium thiosulfate is commonly used in photography as a fixing agent, which helps to remove unexposed silver halides from photographic films and papers, thereby stabilizing the image.

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