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Hypo is used in photography to

1. reduce AgBr grains to metallic silver
2. convert metallic silver to silver salt
3. remove undecomposed silver bromide as a soluble complex
4. remove reduced silver

Correct answer: remove undecomposed silver bromide as a soluble complex

Solution

Hypo (sodium thiosulfate) is used in photography to remove undecomposed silver bromide by forming a soluble complex, ensuring the image is fixed and stable.

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