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प्रश्न
What are the differences between minerals and ores?
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उत्तर
Minerals:
- Minerals contain a low percentage of metal.
- Metal cannot be extracted easily from minerals.
- Clay \[\ce{Al2O3.SiO2.2H2O}\] is the mineral of aluminium.
Ores:
- Ores contain a large percentage of metal.
- Ores can be used for the extraction of metals on a large scale readily and economically.
- Bauxite \[\ce{Al2O3.2H2O}\] is the ore of aluminium.
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संबंधित प्रश्न
The process of leaching alumina, using sodium carbonate is called
- Bayer's process
- Decomposition
- Cyanide process
- Hall's process
Write chemical formulae of the following ores :
(a) Calamine
(b) Haematite
(c) Magnetite
(d) Corundum
Fe2O3 is reduced to spongy iron near the top of blast furance by
(A) H2
(B) CaO
(C) SiO2
(D) CO
Differentiate between “minerals” and “ores”.
Explain the following methods to protect metals from corrosion:
Galvanization
Explain the following methods to protect metals from corrosion:
Passivation
Draw a neat, well labelled diagram of electrolytic cell for extraction of aluminium
The sulphide ore of iron is ____________.
When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ______.
Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?
