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

A) Oxygen

B) Hydrogen sulphide

C) Carbon dioxide

D) Nitrogen

✔ Correct Answer: Hydrogen sulphide

Exam Insight

Brass gets discolored in air primarily due to the presence of sulfur dioxide (SO2), which reacts with the copper in brass to form copper sulfate, a tarnishing compound.

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