Question

Explain with reason : Copper vessel acquire a dull green coating when exposed to air .

Answer 1

Explanation:

it reacts with gasses and moisture in atmosphere and make a mixture of copper carbonate and copper hydroxide

Reaction

2Cu + H2O + CO2 + H2 = CuCO3 + Cu(OH)2

Answer 2

Explanation:

WHEN A COPPER OBJECT REMAINS IN DAMP SIR FOR A CONSIDERABLE TIME,THEN COPPER REACTS SLOWLY WITH THE CARBON DIOXIDE AND WATER VAPOURS OF AIR TO FORM A GREEN COATING OF BASIC COPPER CARBONATE ON THE SURFACE OF THE OBJECT.