Advertisements
Advertisements
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.
Advertisements
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.
\[\ce{MnO + SiO2 ->[Heat] \underset{Manganous silicate (Slag)}{MnSiO3}}\]
APPEARS IN
संबंधित प्रश्न
The reaction,
Cr2O3 + 2Al → Al2O3 + 2Cr
(ΔGθ = -421kJ) is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?
Is it true that under certain conditions, Mg can reduce SiO2 and Si can reduce MgO? What are those conditions?
Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?
Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.
State the role of silica in the metallurgy of copper.
Write chemical reactions taking place in the extraction of copper from Cu2 S.
How will you convert the following:
Zinc blende to Zinc metal
Choose the correct option of temperature at which carbon reduces \[\ce{FeO}\] to iron and produces \[\ce{CO}\].
Below point ‘A’ \[\ce{FeO}\] can ______.
For the reduction of \[\ce{FeO}\] at the temperature corresponding to point D, which of the following statements is correct?
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
Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of sulphur, silicon and phosphorus be removed from cast iron?
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?
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 ______.
