Silver articles turn black when kept in ...

Silver articles turn black when kept in the open for longer time due to the formation of

`H_2S`

`AgS`

`AgSO_4`

`Ag_2S`

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A silver article generally in sunlight turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.

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