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A silver article generally turns black w...

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
(a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
(b) Name the black substance formed and give its chemical formula.

Text Solution

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(a) Silver article turns black when kept in the air because silver article with sulphur compounds such as hydrogen sulphide `(H_(2)S)` present in air. The phenomenon is called corrosion. For silver particularly, it is called tarnishing of silver.
(b) The black substance formed is silver sulphide`(Ag_(2)S)`.
`underset("Silver")(2Ag)+underset(underset("sulphide")("Hydrogen"))(H_(2)S) to underset(underset(underset("(black)")("sulphide"))("Silver"))(Ag_(2)S)+underset("Hydrogen")(H_(2))`
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