Question

Pyrogallol is used in the 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

Hint: Pyrogallol is an organic compound, it is a white water-soluble solid, the sample of the pyrogallol is typically brown in color, because of its sensitivity to oxygen, and it is one of the isometric benzotriazol.

Complete answer:
Mainly pyrogallol is produced by heating gallic acid.
And at the same time, pyrogallol is also produced by the aquatic plant, Myriophyllum spicatum.
This pyrogallol is an alkaline solution, which absorbs oxygen. Initially, it is colorless, and after absorbing the oxygen it turns brown in color.
And pyrogallol is used to calculate oxygen in the air.
When it comes to other uses, It is used as hair dyeing material, other than this, it is also used for dyeing of suture material.
But pyrogallol usage is stopped in hair dyeing because of its toxicity.
As it can absorb oxygen, it is used in gas analysis.
Pyrogallol has antiseptic properties.
Pyrogallol is used as a developing agent, because it is used historically, except for special purposes, nowadays hydroquinone is more commonly used for this purpose.
It is also used in the isolation of inert gases, from a mixture of gases, which require absorption of oxygen from the mixture.
Pyrogallol was widely used as a photographic developer, it was used by a notable photographer by name Edward Watson, pyrogallol rapidly deposits the silver from the silver salts.

Correct option: A. Alkaline solution absorbs oxygen.

Note:
Pyrogallol is more soluble in water than alcohol, and they have high boiling points, and they can present as colorless liquids, or white solids, in the room temperature, and it is toxic and caustic. And it is used in household products as disinfectants.