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प्रश्न
Write the names and chemical formulae of any ‘two’ minerals of aluminium.
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उत्तर
1) Bauxite → `Al_2O_3 .2H_2O`
2) Cryolite → `Na_3AlF_6`
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संबंधित प्रश्न
Write the names and chemical formulae of any one ore of zinc.
Write the names and chemical formulae of any one ore of iron.
What is the chemical composition of malachite?
- CuO . CuC03
- Cu(OH)2 CuC03
- CuO.Cu(OH)2
- Cu2O . Cu(OH)2
Write the reactions involved in the zone of reduction in blast furnace during extraction of iron.
Silica is added to roasted copper ore during smelting process to remove _______.
(A) ferrous sulphide
(B) ferrous oxide
(C) cuprous sulphide
(D) cuprous oxide
What is the role of CO in the extraction of Iron?
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
Copper has the face centred cubic structure. The coordination number of each ion is:
Metals which occur in their native state in nature:
Metal which is found in free state is:
The most abundant metal on earth is:
The sulphide ore of iron is ____________.
In the extraction of aluminium by Hall-Heroult process, purified \[\ce{Al2O3}\] is mixed with \[\ce{CaF2}\] to:
(i) lower the melting point of \[\ce{Al2O3}\].
(ii) increase the conductivity of molten mixture.
(iii) reduce \[\ce{Al^{3+}}\] into \[\ce{Al(s)}\].
(iv) acts as catalyst.
The main reactions occurring in blast furnace during extraction of iron from haematite are:
(i) \[\ce{Fe2O3 + 3CO -> 2Fe + 3CO2}\]
(ii) \[\ce{FeO + SiO2 -> FeSiO3}\]
(iii) \[\ce{Fe2O3 + 3C -> 2Fe + 3CO}\]
(iv) \[\ce{CaO + SiO2 -> CaSiO3}\]
The important ore of iron is:-
In the thermite process, the reducing agent is:
Which of the following is not an ore of magnesiuim?
Calamine and Malachite, respectively, are the ores of ______.
The ore that contains both iron and copper is ______.
