Question

Copper reacts with moist carbon dioxide in the air to form green coloured _____?

Answer 1

Yo!
Here's the answer!
Copper reacts with moist CO2,in the air,to form the green coloured-"PATINA".
Patina is an outer layer of copper oxide, which appears green or bluish-green in color.
Hope that this helps you!
-TGA.

Answer 2

Answer:

Copper reacts with moist carbon dioxide in the air to form green colored copper carbonate.

Explanation:

The green color of copper appears due to the corrosion of copper due to reaction with oxygen and carbon dioxide for copper carbonate.

2Cu + O2 --> 2CuO

CuO + CO2 --> CuCO3

Copper carbonate is green color compound.

Many copper statues are turned green due to corrosion of copper in form of copper carbonate. Rain water reacts with carbon dioxide form acid rain containing carbonic acid (H2CO3). Acid rain water reacts with copper statues to turn them green.  

Cu + H2CO3 --> CuCO3 + H2