Multiple choice general knowledge science & technology

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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Brass tarnishes due to hydrogen sulfide (H2S) in the atmosphere, which reacts with copper in the brass to form a dark copper sulfide layer. Oxygen causes slower oxidation, while carbon dioxide and nitrogen don't produce this characteristic discoloration.

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