Question

objects made of silver become black with the passage of time. explain

Answer 1

It is because Silver also "rusts", just like Iron. The proper term is tarnishing of silver. It reacts with hydrogen sulphide and forms a grey, brown or after a heavy reaction, a black layer of Silver sulphide. Unlike rusting, which corrodes Iron and destroys it, Tarnishing forms a protective outer layer and saves the internal material from tarnishing.

Answer 2

WHEN SILVER OBJECTS ARE KEPT IN AIR, THEY GET TARNISHED AND GRADUALLY TURN BLACK DUE TO THE FORMATION OF A THIN SILVER SULPHIDE LAYER ON THEIR SURFACE BY THE ACTION OF HYDROGEN SULPHIDE PRESENT IN THE AIR.

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