Are all pure gases clear?

Answer #1

yes unless they have a dye added to them

Answer #2

If by “clear” you mean “colourless” then the answer is no . e.g. Chlorine is a greenish yellow. .

– Best wishes - Majikthise. .

Answer #3

Yeah, most are colorless except maybe some of the halogens like chlorine (greenish yellow) and bromine (reddish brown)

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