Which of the following is iron ore?

Bauxite

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Kaolinite

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Haematite

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Both (a) and (b) above

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Solution

The correct option is C Haematite
Ores of Aluminium:
1. Bauxite - $A l O_{x} (O H)_{3 - 2 x}$ [Where 0<x<1]
2. Kaolinite - $[A l_{2} (O H)_{4} S i_{2} O_{5}$ ]

For the purpose of extraction, bauxite is chosen for aluminium.
Ores of Iron:
1. Haematite - $F e_{2} O_{3}$
2. Magnetite - $F e_{3} O_{4}$
3. Siderite - $F e C O_{3}$

For iron, usually the oxide ores which are abundant and do not produce polluting gases (like $S O_{2}$ that is produced in case iron pyrites) are taken.

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