Ore (Text Book)

Ans.

1. The mineral from which a metal can be extracted profitably is called an ore.
2. When an ore is mined from the earth, it always contains impure sand and rocky material.
3. The impurity of sand and rocky material present in an ore is called cangue.
4. The gangue is mainly composed of silica.
5. Main ores of iron: Haematite (Fe₂O₃), Magnetite (Fe₃O₄).
6. Main ores of aluminium Bauxite (Al₂O₃. 2H₂O)