Question

What happens when a copper vessel is exposed in moist air for long time

Answer 1

HI MATE ,

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.  

The reaction is as follows:

2Cu + H2O + CO2 + O2 →  Cu(OH)2  +  CuCO3

HOPE IT HELPS YOU...

Answer 2

it gets oxidized....and corroded due to moisture present in air