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  • 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.

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.

Answers (1)

a) Silver reacts with H_2S present in the atmosphere to form a black color compound Silver Sulphide. This phenomenon is called as corrosion.

 b) Black color compound formed is Silver Sulphide

2Ag+ H_2S \rightarrow Ag_2S + H_2

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