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.
Colourless, or slightly white
Methane is a colourless, flammable gas that is the main component of natural gas.
Helium is a colourless gas
Colourless gas
It is a colourless gas.
Yes, oxygen is a colourless gas.
Oxygen is a colourless, odorless gas
colourless gas
It is a colourless gas at STP