First slide

General methods of extraction of elements from the earth crust

Question

Which is (are) not an ore?

Moderate

A

Bauxite
B

Zinc blende
C

Pig iron
D

Wrought iron

Solution

Wrought iron is purest commercial form of iron; pig iron is impure iron.
Bauxite: Ore ofAl; Al₂O₃.2H₂O
Zinc blende: Ore of Zn; ZnS

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