Oxygen is absorbed by an alkaline solution of:

sodium hydroxide

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potassium hydroxide

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pyrogallol

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ammonium hydroxide

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Solution

The correct option is B pyrogallol
Pyrogallol is a white solid. It is very sensitive towards oxygen.
When an alkaline solution, it absorbs oxygen from the air, turning brown from a colourless solution. It can be used in this way to calculate the amount of oxygen in the air.
So answer is $C$ .

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