Question

object made of silver become black with the pasaage 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.

Answer 2

silver is like a iron and it also reacts with hydrogen sulphide and form grey white or black colour layer.

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