Question

Copper gets corroded on exposure to air . name the component of air which corrodes copper . also name the substance formed on copper

Answer 1

Moist air containing CO2 and O2 under goes reaction with copper by corroding it.

The chemical name of the coating that forms on copper articles when they are left exposed to moist air.

copper- mixture of copper carbonate [CuCO3]and copper hydroxide [Cu(OH)2]

Copper in moist air (containing CO2 and oxygen) slowly acquires a dull green coating. The green material is a 1:1 mole mixture of Cu(OH)2 and CuCO3.

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

This is the patina that forms on bronze and other copper alloy statues such as the Statue of Liberty.