Question

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.

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Answer 1

Answer:

Silver article reacts with sulphur compounds in the atmosphere like hydrogen sulphide to form silver sulphide.The black substance formed is silver sulphide -(Ag2S)