Chemistry
The main ore used for the extraction of iron is:
- Haematite
- Calamine
- Bauxite
- Cryolite
Metallurgy
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Answer
Haematite [Fe2O3]
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Related Questions
Name the alloy used for the following purposes.
(a) Making electric circuits
(b) Making medals
(c) Making parts of watches
(d) Surgical instruments
(e) Aircraft
Using the information in the table below, complete the following :
(i) …………… is the metallic element.
(ii) Metal atoms tend to have a maximum of …………… electrons in the outermost energy level.
(iii) Non-metallic elements tend to form …………… oxides while metals tend to form …………… oxides.
(iv) Non-metallic elements tend to be …………… conductors of heat and electricity.
(v) Metals tend to …………… electrons and act as …………… agents in their reactions with elements and compounds.
X Y Normal electronic configuration 2, 8, 7 2, 8, 2 Nature of oxide Dissolves in water and turns blue litmus red Very low solubility in water. Dissolves in hydrochloric acid Tendency for oxidizing and reducing reactions Tends to oxidise elements and compounds Tends to act as a reducing agent Electrical and thermal conductivity Very poor electrical conductor and poor thermal conductivity Good electrical conductor and good thermal conductor Tendency to form alloys and amalgams No tendency to form alloys Forms alloys Heating an ore in a limited supply of air or in the absence of air at a temperature just below it's melting point is known as :
- Smelting
- Ore dressing
- Calcination
- Bessemerisation
The compound that is not an ore of aluminium:
- Cryolite
- Corundum
- Fluorspar
- Bauxite