1.

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if (of) iron is _____.

Answer»

Correct answer is 4.

Bauxite — AlOX(OH)3–2x(where 0 < x < 1)

✓ Siderite — FeCO3

Cuprite — Cu2O

Calamine — ZnCO3

✓ Haematite — Fe2O3

Kaolinite — Al2(OH)4Si2O5

Malachite — CuCO3 . Cu(OH)2

✓ Magnetite — Fe3O4

Sphalerite — ZnS

✓ Limonite — Fe2O3.3H2O

Cryolite — Na3AlF6



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