Q. 74.4( 7 Votes )
A metal 'X ' acqu
(a) X is copper. When the copper is exposed in air, a coating of green colour takes place on it. The process responsible for this is corrosion of copper. When a metal is attacked by substances around it such as moisture, acids, etc., it is said to corrode, and this process is called corrosion.
(b) The green coating formed on the metal is a copper carbonate. It is formed when copper reacts with carbon dioxide present in the air. The reaction is given as:
2Cu + H2O + CO2 + O2 (present in air) → CuCO3.Cu(OH)2
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