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Building Materials

Q1: Minimum of 40% of iron, is available in

A Magnetite

B Red haemetite

C Limonite <

D Siderite

E Black band.

ANS:E - Black band.

Answer is siderite.

(1) Haematite Red oxide of iron (Fe2O3) 65 to 70% of iron.

(2) Limonite 2Fe2O3, 3H2O (60% of iron).

(3) Magnetite Fe3O4 (70 to 73% of iron).

(4) Pyrite FeS2 (45 to 47% of iron).

(5) Siderite FeCO3 (40% of iron).



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