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प्रश्न
The purest form of iron is prepared by oxidising impurities from cast iron in a reverberatory furnace. Which iron ore is used to line the furnace? Explain by giving reaction.
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उत्तर
Haematite\[\ce{(Fe2O3)}\] is used. It supplies the oxygen and oxidises carbon, silicon, manganese and phosphorus present in the cast iron to \[\ce{CO}\], \[\ce{SiO2}\], \[\ce{MnO}\] and \[\ce{P2O5}\] respectively.
\[\ce{Fe2O3 + 3C ->[Heat] 2Fe + 3CO}\]
\[\ce{3Si + 2Fe2O3 -> 4Fe + 3SiO2}\]
\[\ce{3S + 2Fe2O3 -> 3SO2 + 4Fe}\]
\[\ce{CO}\] and \[\ce{SO2}\] escape and \[\ce{MnO}\] and \[\ce{SiO2}\] combine to form manganous silicate \[\ce{(MnSiO3)}\] as slag.
\[\ce{MnO + SiO2 ->[Heat] \underset{Manganous silicate (Slag)}{MnSiO3}}\]
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संबंधित प्रश्न
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In the extraction of copper from its sulphide ore, the metal is formed by the reduction of \[\ce{Cu2O}\] with ______.
In the metallurgy of aluminium ______.
Choose the correct option of temperature at which carbon reduces \[\ce{FeO}\] to iron and produces \[\ce{CO}\].
For the metallurgical process of which of the ores calcined ore can be reduced by carbon?
(i) Haematite
(ii) Calamine
(iii) Iron pyrites
(iv) Sphalerite
How is copper extracted from low grade copper ores?
The mixture of compounds A and B is passed through a column of \[\ce{Al2O3}\] by using alcohol as eluant. Compound A is eluted in preference to compound B. Which of the compounds A or B, is more readily adsorbed on the column?
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Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800 K.
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Explain the following:
Generally sulphide ores are converted into oxides before reduction.
Explain the following:
Carbon and hydrogen are not used as reducing agents at high temperatures.
Assertion: For the extraction of iron, haematite ore is used.
Reason: Haematite is a carbonate ore of iron.
\[\ce{Au + CN^- + H2O + O2 -> [Au(CN)2]^- + OH^-}\]
The number of CN− ions involved in the balanced equation is ______.
