Question

___________ is colourless gas​

Answer 1

Answer:

Colourless, odourless gas is usually associated with negative things like Carbon Monoxide and Radon, but these types of gases can have many beneficial uses as well from food packaging to oh, allowing us to breathe! The most common examples of beneficial colourless, odourless gas are: Argon. Carbon Dioxide.

mark as brainliest

Answer 2

Answer:

Helium is a colourless gas.

Explanation:

All the Noble gases are considered to be colorless. Xenon, Argon, Neon, Krypton, Radon, Helium. But remember one thing, they themselves do not poses any color but when they are treated they show some colors.For example, He when it is burned gives out Blue xenon color and when treated with electric current it changes to orange color.

Apart from Noble gases,Hydrogen,oxygen,Nitrogen etc also are colorless.