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Have you seen the following things ? ...

Have you seen the following things ?
Old iron bas or buildings copper vessles not cleaned for long time, silver ornamentsor idols exposed to air for long, old abandoned vehicles fit to be thrown away.

Text Solution

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(i) After keeping for a long time in air or in open when these above things come in contact with air and water, it reacts with it and a layer is formed above its, surface. They get corroded.
(ii) Iron has - They get rusted as coating of Iron oxide `(Fe_(2)O_(3)*H_(2)O)`is formed.
Copper vessels- They react with `CO_(2)` in moist air and a coating of copper carbonate `(CuCO_(3))` is formed.
Silver Ornaments - They react with`H_(2)S` is air and a layer of silver sulphide `(Ag_(2)S)` is formed.
Old abandoned vehicles- They are rusted and coatingof Iron oxide `(Fe_(2)O_(3)*H_(2)O)` is formed.
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