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Extraction of Magnesium

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Question

what is the formula of the ores of aluminium and iron

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Solution

Ores of aluminium:
Bauxite : Al₂O₃
Cryolite : Na₃AlF₆
Corundum : Al₂O₃

Ores of iron:
Haematite : Fe₂O₃
Magnetite : Fe₃O₄
Iron pyrites : FeS₂
Siderite : FeCO₃

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Q. Write name.
Molecular formula of the common ore of aluminium.

Q. Write the name and formulae of two ores for each of the following:
(a) iron
(b) zinc
(c) aluminium

(a) Give the chemical names and formulae of main ores of (i) aluminium (ii) iron (iii) zinc.

(b) Which impurities are present in bauxite.

(c) What is red mud, how is it removed?

Q. The following questions refer to the extraction of aluminium and iron from their ores:
(a) Name the principle ore from which (i) iron, and (ii) aluminium are extracted.
(b) What is the most important chemical process in the extraction of any metal? State how this essential step is carried out in the extraction of: (i) iron, (ii) aluminium.
(c) Iron and aluminium ores both, contain impurities. Explain, briefly how these impurities are removed in each case.
(d) What is the major impurity present in iron when it is removed from the furnace?
Name an alloy of zinc is used in simple voltaic cells.

Q. What is the melting point of iron and aluminium? How is iron melted?

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