Question

Metal X acquires a dull greenish coating when left exposed to moisture and air for long

time.

a) Identify X and name the process taking place

b) Write balanced chemical equations involved

c) Name the substance which forms green coating​

Answer 1

Answer

(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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Answer 2

Explanation:

Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.