Question
The black coating formed on the surface of silver articles due to corrosion is ______.
Answer: Option B
:
B
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B
Corrosion is a process of conversion of a metal into its compound ie. oxides or carbonates etc. by continuous interaction with atmospheric air and water vapour.
On exposure to air for a long time, silver articles combine with sulphur in the atmosphere. As a result, black coating of silver sulphide is formed on their surface. The reaction involved is:
2Ag(s)+H2S(g)→Ag2S(s)+H2(g)
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