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  • (a) Silver articles generally turn black when kept in the open for a few days. The articles when rubbed with tooth-paste again start shining.  (i) Why do silver articles turn black when kept in the open for a few days ? Name the p

(a) Silver articles generally turn black when kept in the open for a few days. The articles when rubbed with tooth-paste again start
shining. 

(i) Why do silver articles turn black when kept in the open for a few days ? Name the phenomenon involved.
 

 
 
 
 
 

Answers (1)

Silver metal is attacked by moisture, acids and sulphur compound resulting in the formation of a black coloured layer of silver sulphide(AgS). This process is called corrosion. 

The original colour and lustre of silver metal are restored by rubbing the surface with toothpaste as this removes the sulphide layer.
 

Posted by

Satyajeet Kumar

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