Question

The reason of colour changing of silver anklet after few day is: * 1 point formation of silver sulphide. formation of silver nitrate.

Answer 1

Hence:-

Silver article turns black when kept in the air because silver article reacts with sulphur compounds such as hydrogen sulphide (H

2

S) present in air.

Ag+H

2

S→Ag

2

S+H

2

The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.

Silver sulphide (Ag

2

S) is the black substance formed

Answer 2

The reason for colour changing of the silver anklet after few days is due to the formation of silver sulphide.

CORROSION -

• The blackening of silver in the air is due to the phenomenon known as corrosion.
• The process is also known as the tarnishing of silver.
• The silver reacts with the hydrogen sulphide present in the atmosphere to form silver sulphide.
• The silver sulphide is a black-colored layer formed on the white lustrous layer of the silver.
• The reaction can be given as -

$Ag + H_2S$ → $Ag_2S + H_2$