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प्रश्न
What is the role of the following compound-
SiO2 in the extraction of copper from copper pyrites?
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उत्तर
Role of SiO2 in the extraction of copper from copper pyrites:
- The copper matte containing Cu2S and FeS is put in silica lined converter in order to remove impurities as fusible slag. Som silica is also added and hot air blast is blown to convert remaining FeS to FeO, which is removed as slag with silica.
\[\ce{\underset{\text{Ferrous sulphide}}{2FeS} + \underset{\text{From blast of hot air}}{3O_2} -> \underset{\text{Ferrous oxide}}{2FeO} + \underset{\text{Sulphur dioxide}}{2SO_2}}\] - Ferrous oxide combines with silica (flux) to form fusible slag.
\[\ce{\underset{\text{Ferrous oxide}}{FeO} + \underset{\text{Silica (Flux)}}{SiO_2} -> \underset{\text{Ferrous silicate (Fusible slag)}}{FeSiO_3}}\]
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संबंधित प्रश्न
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
Purification of aluminium by electrolytic refining is carried out by
(a)Hoope process
(b)Hall process
(c)Baeyer process
(d)Serperck process
What is the role of CO in the extraction of Iron?
What is the role of coke in the extraction of iron from its oxides?
Indicate the principle behind the method used for the refining of zinc.
Which form of the iron is the purest form of commercial iron?
Which of the ores mentioned can be concentrated by magnetic separation method?
Explain the following methods to protect metals from corrosion:
Passivation
Why does copper obtained in the extraction from copper pyrites have a blistered appearance?
What is 'copper matte' ?
Describe the role of the cryolite in the extraction of aluminium from pure alumina.
How will you convert the following:
[Ag(CN)2]− to Ag
Bauxite has the composition
Give the uses of zinc.
Metals which occur in their native state in nature:
Which among the following statement is correct?
When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ______.
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) \[\ce{CaO + SiO2 -> CaSiO3}\]
Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.
The important ore of iron is:-
In the thermite process, the reducing agent is:
Extraction of zinc from zinc blende is achieved by:-
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
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.
The ore that contains both iron and copper is ______.
