1.

An article made of metal ‘X’ acquires a blackish tinge on exposure to air after a few days. The metal ‘X’ is1. Gold2. Silver3. Aluminium4. Iron

Answer» Correct Answer - Option 2 : Silver

The correct answer is Silver

  • Silver articles when exposed to air become black after some time.
  • This is because the silver metal reacts with the sulphur present in the atmosphere and forms silver sulphide (black colour).

  • The silver article turns black when kept in the air because the silver article reacts with sulphur compounds such as hydrogen sulphide (H2S) present in the air. Ag+H2S→Ag2S+H2
  • ​The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.
  • Silver sulphide (Ag2S) is the black substance formed.


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