Question

Pyrogallol is used in gas analysis because its

• A. Alkaline solution absorbs oxygen
• B. Acidic solution absorbs oxygen
• C. Alkaline solution reacts with carbon dioxide
• D. Acidic solution absorbs nitrogen

Answer 1

The correct option is A Alkaline solution absorbs oxygen

A pyrogallol is also called as 1,2,3-trihydroxybenzene. It is a benzenetriol. It is a reducing agent. It is used as a developer in photography. It is also used as a coupling agent in printing. It undergoes rapid autooxidation in alkaline solution. Hence, its alkaline solution is used in the gas analysis because it absorbs oxygen.

Thus, the correct answer is 'Alkaline solution absorbs oxygen'.