Question

what is the process of changing the colour of copper to green.​

Answer 1

This process is called as rusting ..

when oxygen In air react with Copper .

a green colour layer get accumulated on material of copper .. to prevent it nowdays a powder coating is used ..

Answer 2

Nitrogen, oxygen, carbon dioxide, moisture, and a few more gases make up air. When some of these gases come into contact with copper, they produce a variety of compounds. These compounds coat the surface of copper metal, giving it a green hue.

Explanation:

• Corrosion causes the green colour to appear.
• Copper metal forms a mixture of hydroxide and carbonate of copper when exposed to the atmosphere during the monsoon.
• The reaction of copper metal with water (from ambient moisture) and oxygen and carbon dioxide gases produces this combination (present in the atmosphere).
• A green coating is applied to the surface of copper metal, which contains copper hydroxide and carbonate. The combination of copper hydroxide and carbonate is known as basic carbonate.