Question

Why did the jellewery become black when exposed to air?what this process called?

Answer 1

When the jewellery is exposed to air it reacts with atmospheric gases which causes them to undergo corrosion by forming a layer of compounds on it's surface.

This process is known as corrosion.

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Answer 2

Jewellery becomes black on exposure to air for sometime. When these articles( particularly silver) exposed to air it reacts with sulphur present in the atmosphere and form a black layer of silver sulphide on the surface.

Copper articles get tarnished by reacting with air and water. Due to this, a layer is formed over copper vessels. This layer mainly contains black copper oxide and green copper hydroxide.


The jewellery reacts with the atmospheric gases and form a black layer.

This process is called CORROSION.

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