Occurance of metals

Metal and Non-metals of Class 8

ORES OF REACTIVE METALS:

The ores of very reactive metals, such as sodium or calcium, contain chlorides or carbonates of the metals, for example, rock salt (NaCl), dolomite (CaCO3 · MgCO3).

ORES OF LESS REACTIVE METALS:

The ores of other metals, such as aluminum, iron, copper or zinc, contain mostly oxides or sulphides, for example, bauxite (Al2O3), iron pyrite (FeS2), hematite (Fe2O3), copper glance (CuS), and zinc blende (ZnS).

METALLURGY:

The series of processes carried out to extract pure metals from their ores is called metallurgy.

Occurance of metals

SOME METALS:

S.No.	Compounds	Minerals
1.	Oxides	Bauxite (AI2O3. 2H2O), Magnetite (Fe3O4)
2.	Sulphides	Copper Pyrites (CuFeS2), Cinnabar (HgS)
3.	Carbonates	Magnesite (MgCO3), Limestone (CaCO3), Calamine (ZnCO3)
4.	Halides	Common salt (NaCI), Horn silver (AgCl)
5.	Sulphates	Gypsum (CaSO4 . 2H2O), Epsom Salt (MgSO4. 7H2O)
6.	Phosphates	Rock Phosphate [Ca3(PO4)2]
7.	Silicates	China clay (AIzO3 . 2SiO2 . 2H2O)