Q. 125.0( 2 Votes )

It has been notic

Answer :

Pollution of the environment has lead to an increase in sulphur present in the air. Now, since sulphur is readily available, silver reacts with it and thus becomes black:

2Ag + H2S (present in air) Ag2S + H2

The black coating is of Ag2S. Fifty years ago, the air was less polluted so was the amount of sulphur in the air and thus less sulphur was available for reacting with silver jewellery.

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