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Physical properties of Metals and Non-Metals
Chemical Properties of Metals
— Rusting of Iron: In presence of moisture and air (O2), rust gets deposited over iron.
Iron (Fe) + Oxygen (O2) + Water (H2O) → Brown coloured rust (Fe2O3)
— Greenish deposit on the surface of copper vessels: The dull greenish material deposited on the surface of copper is a mixture of copper hydroxide [Cu(OH)2] and copper carbonate (CuCO3) that takes place:
— Metallic oxides are basic in nature.
Potassium (K) and Calcium (Ca) are also active metals and react with water at room temperature. Such metals are stored in kerosene.
Some other metals do not do so. For example, iron reacts with water slowly.
Hydrogen burns with a ‘pop’ sound, when a burning matchstick is brought near it.
In general, more active metals displace less active metals from their solutions. In this case, Zinc is more reactive than Cu, so it replaces copper (Cu) from copper sulphate solution.
The rule is that ‘a more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal’.
Thus, metals are arranged in order of their decreasing activity. This arrangement is called the activity series.