Question

A silver article generally turns black when kept in open for few days. The article when rubbed with toothpaste again shining.

1. Why do silver articles turns black when kept in open.
2. Name the black substance formed and give its chemical formula

Answer 1

Silver sulphide is the substance it is formed wjen silver react with hydrogen sulphide which is present in air

Answer 2

Answer:

a) Silver articles turn black when kept in the air for a few days because H2S gas presents in the air attacks silver forming a coaling of black silver sulphide. The phenomenon is called corrosion.

b) Black substanceformed is SilverSulphide

2Ag+H2S-------->Ag2S+H2

Explanation:

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