Question

Why do silver articles become black on prolonged exposure to air?

Answer 1

when silver is exposed to air it becomes black due to the formation of layer of oxide coating though Silver is not a very reactive metal but with the passage of time it slowly react with oxygen in the air and forms black colour Silver oxide

Answer 2

when silver is exposed to air it becomes black due to the formation of layer of oxide coating though Silver is not a very reactive metal but with the passage of time it slowly react with oxygen in the air and forms black colour Silver oxide