Correct Answer - Option 1 : Hematite
Ore is natural rock or sediment that contains one or more valuable minerals, typically containing metals, that can be mined, treated and sold at a profit.
- The chief ores of iron consist mainly of the oxides: Hematite, Fe2O3.
- Hematite naturally occurs in black to steel or silver-grey, brown to reddish-brown, or red colours.
- It is mined as an important ore of iron. It is electrically conductive.
- ferric oxide (Fe2O3), which constitutes the most important iron ore because of its high iron content (70 per cent) and its abundance.
Hence, we can conclude that The chief ore of iron is Hematite.
- Hematite shows only a very feeble response to a magnetic field.
- Bauxite is the principal ore of aluminium with chemical formulae Al2O3. 2H2O.
- Limonite is an iron ore consisting of a mixture of hydrated iron (III) oxide-hydroxides in varying compositions.
