A silver article generally turns black when kept in the open for few days. The article when rubbed with toothpaste again starts shining. (a) Why do silver articles turn black when kept in open for few days? Name the phenomenon involved. (b) Name the black substance formed and give its chemical formula
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Answered by
981
a)Silver metals develop a black layer of silver sulphide and reacts with hydrogen sulphide present in atmosphere.For help equation-
Ag+H₂S⇒Ag₂S+H₂
The phenomenon involved is corrosion of silver metal.
b)Silver sulphide(Ag₂S) is the black substance formed
Ag+H₂S⇒Ag₂S+H₂
The phenomenon involved is corrosion of silver metal.
b)Silver sulphide(Ag₂S) is the black substance formed
Answered by
103
Answer:
(a) Silver article turns black when kept in the air because silver article reacts with Sulphur compounds such as hydrogen sulphide (H2S) 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
Explanation:
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