Which one of the following is the colour of hydrogen gas?

[amp_mcq option1=”Light yellow” option2=”Orange” option3=”Black” option4=”Colourless” correct=”option4″]

This question was previously asked in

UPSC NDA-1 – 2022

The correct answer is Colourless. Hydrogen gas (H₂) is a colourless gas.

– Hydrogen is the lightest and most abundant element in the universe.
– At standard temperature and pressure, hydrogen exists as a diatomic molecule (H₂) and is a gas.
– Pure hydrogen gas is colourless, odourless, and tasteless.
– It is also highly flammable.

Many common gases like nitrogen (N₂), oxygen (O₂), noble gases (He, Ne, Ar, etc.), and carbon dioxide (CO₂) are also colourless. Some gases do have colour, such as chlorine (greenish-yellow), bromine vapour (reddish-brown), iodine vapour (violet), and nitrogen dioxide (reddish-brown).

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