Question

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 1

Correct answer is 4.

Bauxite — AlO_X(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