Question

Copper becomes green when exposed to moist air

Answer 1

heya friend

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.

Answer 2

Copper turns green when exposed to moist air becoz of corrosion.
When copper is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.