Question

why do copper vessel lose shine when exposed to air? ​

Answer 1

Answer:

when the copper form a protective layer of oxidation on the surface ,at the surface of the vessel, copper atom react with oxygen and called copper oxide

Answer 2

HELLO

COPPER VESSAL LOSE SHINE WHEN EXPOSED TO AIR BECAUSE carbon dioxide in moist air react with the surface of copper vessals .

copper loses its luster due to formation of greenish layer of the copper carbonate (cuco3 ) on its surface .this is called patination of copper ...