First slide

General methods of extraction of elements from the earth crust

Question

Which of the following pairs consists of ore of the same metal?

Moderate

A

Magnesite, cerussite
B

Chalcocite, copper pyrites
C

Bauxite, corundum
D

Anglesite, cerussite

Solution

Chalcocite: Cu₂S; Pyrites: CuFeS₂
Bauxite: Al₂O₃.2H₂O; Corundum: Al₂O₃
Anglesite: PbSO₄; Cerussite: PbCO₃
Mgnesite: MgCO₃; Cerussite: PbCO₃

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