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A silver article generally sunlight turn...

A silver article generally sunlight turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
Name the black substance formed and give its chemical formula.

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The black substance formed is thin black coating of silver sulphide `(Ag_(2)S)` because silver (Ag) reacts with `H_(2)S` present in air.
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OSWAL PUBLICATION-CHEMICAL REACTIONS-NCERT EXEMPLAR (Short Answer Type Questions)
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