A black coating is observed on silver articles when left open in surroundings. This is due to .

corrosion

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decompositon

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reduction

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Solution

The correct option is A corrosion
Corrosion is the gradual destruction of materials by chemical reaction with their air, water or chemicals in the environment.
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.

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