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Question

Why do silver articles turn black when kept open for a few days?
(a) Name the phenomenon involved.
(b) Name the black substance formed and give its chemical formula.

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Solution

  • Silver article turns black when kept in the air because silver article reacts with sulphur compounds such as hydrogen sulphide (H2S) present in air.
Ag+H2SAg2S+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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