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Question

Which of the following is/are example(s) of corrosion?


  1. Rusting of iron

  2. Tarnishing of copper

  3. Liquefaction of ammonia

  4. Tarnishing of silver


Solution

The correct option is D

Tarnishing of silver


Corrosion is the deterioration of the surface of a substance, mainly when exposed to factors like oxygen, moisture, carbon dioxide, chemicals, etc.

Iron (Fe) forms a reddish brown layer of rust, (Fe2O3.nH2O), formed when iron comes in contact with moisture and oxygen. It is called rusting of iron.

Copper (Cu) forms a greenish coating of basic copper carbonate, ((CuCO3.Cu(OH)2), when exposed to CO2, O2 and H2O. It is called tarnishing of copper.

Silver (Ag) forms a black layer of silver sulphide, (Ag2S), when silver is exposed to an atmosphere containing hydrogen sulphide (H2S) gas. It is called tarnishing of silver.

Liquefaction of ammonia is not an example of corrosion but it is a process to convert gaseous ammonia to liquid ammonia.

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