First slide

General methods of extraction of elements from the earth crust

Question

Which is not an ore of iron?

Moderate

A

Magnetite
B

Haematite
C

Limonite
D

Cuprite

Solution

Magnetite: Fe₃O₄; Haematite: Fe₂O₃,
Limonite: Fe₂O₃.3H₂O; Cuprite: Cu₂O

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