Subject: How is oxygen absorbed from a mixture of gases?

The question has to do with the laboratory procedure for removing the
common gas oxygen when it occurs or is present as an unwanted constituent
in the process of preparing some other gas. In my chemistry book, they
describe how to purify gases like hydrogen chloride or liquids like
sulphuric acid during laboratory production to get rid of undesirable
contaminants, but there is no mention of the (usual) way to eliminate
oxygen from a mixture of gases.

Re: How is oxygen absorbed from a mixture of gases?