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Which would quickly absorb oxygen?

1. Alkaline solution of pyrogallol
2. Conc. H2SO4
3. Lime water
4. Alkaline solution of CuSO4

Correct answer: Alkaline solution of pyrogallol

Solution

An alkaline solution of pyrogallol absorbs oxygen rapidly due to its ability to undergo oxidation in the presence of oxygen, forming a dark-colored product.

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