Lots of gases are colorless. You'd have to be more specific.
yes. it is colourless
Oxygen is a gas, therefore it is colourless.
Yes. argon is a colourless, odourless, noble gas.
Helium is a light colourless gas that does not burn
Colourless, or slightly white
Yes.
NO-gas is colourless
Helium is a colourless gas
Colourless gas
air
It is a colourless gas.
colourless gas.