Question

Give reason: Copper utensils develop a greenish layer on their surface.

Answer 1

Answer:

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.

Explanation:

please mark as brainlist

Answer 2

Answer:

The reason for occurrence of this change on the metal surface is because of chemical reaction of oxygen, moisture and other gases present in the air with the metals.

The phenomenon of gradual destruction of metal due to action of air and moistuer is called corrosion. The rate of Corrosion is different for different metals.

Copper reacts with moist carbon dioxide in the air due to which the metal losses its characteristic shining reddish brown colour and gets coated with green colour copper carbonate.

Copper + Carbon dioxide + Water → Copper Carbonate

$\boxed{\sf{Cu+CO_2+H_2O \longrightarrow CuCO_3.nH_2O}}$