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Brass gets discoloured in air because of the presence of which of the following gases in air?

1. Oxygen
2. Hydrogen sulphide
3. Carbon dioxide
4. Nitrogen

Correct answer: Hydrogen sulphide

Solution

Brass discolours in air because hydrogen sulphide reacts with the copper present in brass to form a dark sulphide layer. This causes tarnishing of the metal surface.

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