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

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

  • (A) Carbon dioxide
  • (B) Oxygen
  • (C) Hydrogen Sulphide
  • (D) Nitrogen
At its core, brass is an alloy formed by the combination of copper and zinc. When it is exposed to air containing small amounts of hydrogen sulphide (H₂S), the chemical reaction acts specifically on the copper in the alloy, resulting in the formation of copper sulfide, CuS, which is dark brown to black in color and settles on the surface, causing the brass to lose its characteristic yellow-gold luster and giving it an unattractive, stained, or tarnished appearance.
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 ‘NATO’ is an abbreviation of:

March 18, 2026 No Comments
  • (A) North Atlantic Treaty Organization
  • (B) Non-Aligned Treaty Organization
  • (C) Non-Aligned Trading Organization
  • (D) North American Transport Organization

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