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प्रश्न
What is the role of coke in the extraction of iron from its oxides?
Describe the role of the coke in the extraction of iron from its oxides.
उत्तर १
Coke reduces the iron oxide to molten iron metal. Also, coke, when burnt in the blast furnace, supplies the heat required for carrying out the extraction of iron from its oxide.
FeO + C → Fe + CO
उत्तर २
In the extraction of iron from its oxide, coke acts as
(a) fuel
(b) Reducing agent
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संबंधित प्रश्न
Write the names and chemical formulae of any one ore of iron.
Write chemical formulae of the following ores :
(a) Calamine
(b) Haematite
(c) Magnetite
(d) Corundum
In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
Describe the roles of the following: SiO2 in the extraction of copper from copper matte
Name the method used for refining of copper metal.
Differentiate between “minerals” and “ores”.
Explain the following methods to protect metals from corrosion:
Passivation
What is 'copper matte' ?
What is the role of the following compound-
SiO2 in the extraction of copper from copper pyrites?
Bauxite has the composition
Metal which is found in free state is:
Which of the following options are correct?
(i) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
(ii) In extraction of silver, silver is extracted as cationic complex.
(iii) Nickel is purified by zone refining.
(iv) Zr and Ti are purified by van Arkel method.
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) \[\ce{CaO + SiO2 -> CaSiO3}\]
In the electrolytic process for the extraction of aluminium the electrolyte is:-
When compared to ΔG° for the formation of Al2O3 ΔG° for the formation of Cr2O3 is
Native silver metal forms a water solution complex with dilute solution of Na CN in the presence of
Match List I with List II.
| List - I | List - II | ||
| a. | Siderite | I. | FeCO3 |
| b. | Malachite | II. | CuCO3 · Cu(OH)2 |
| c. | Sphalerite | III. | ZnS |
| d. | Calamine | IV. | ZnCO3 |
Choose the correct answer from the option given below.
