oxygen
nitrogen
water vapour
carbon (IV) oxide
noble gases
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A. Oxygen is the component of air that can be removed by alkaline pyrogallol solution. Pyrogallol is a reducing agent that can react with oxygen to form water and carbon dioxide. In the presence of an alkali, such as potassium hydroxide, the reaction is accelerated, and oxygen can be rapidly and quantitatively removed from a gas mixture. This reaction is often used to determine the amount of oxygen in a sample of air or other gas mixture, and it is known as the "pyrogallol method." The other components of air, such as nitrogen, water vapor, carbon dioxide, and noble gases, are not affected by this reaction and cannot be removed by pyrogallol solution.
stop editing ans without confirmation. Alkaline pyrogallol will only absorb oxygen. The ans is 100% A
Alkaline pyrogallol solution absorbs water while caustic soda absorbs Carbon (IV) Oxide. So the correct answer should be water vapour.
