Advertisements
Advertisements
प्रश्न
Choose the correct option of temperature at which carbon reduces \[\ce{FeO}\] to iron and produces \[\ce{CO}\].
विकल्प
Below temperature at point A.
Approximately at the temperature corresponding to point A.
Above temperature at point A but below temperature at point D.
Above temperature at point A.
Advertisements
उत्तर
Above temperature at point A.
Explanation:
\[\ce{FeO + C -> Fe + CO}\]
It can be seen as a couple of two simpler reactions:
\[\ce{FeO -> Fe + 1/2 O2 (ΔG^Θ_{FeO, Fe})}\]
\[\ce{C + 1/2 O2 -> CO (ΔG^Θ_{C, CO})}\]
Total Gibb's energy change becomes
\[\ce{ΔG^Θ_{(C, CO)} + ΔG^Θ_{(FeO, Fe)} ΔrG^Θ}\]
In \[\ce{ΔG^Θ}\] verus T plot, the plot Fe to FeO goes upward and the plot for C to CO goes downwards.
At temperature above point A, the C to CO line comes below Fe to FeO and \[\ce{ΔG^Θ_{(C, CO)} < {ΔG^Θ_{(Fe, FeO)}}}\]
So on this range, \[\ce{C}\] will reduce \[\ce{FeO}\] to \[\ce{Fe}\] and itself be oxidized to \[\ce{CO}\].
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?
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.
In the metallurgy of aluminium ______.
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 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.
Why is sulphide ore of copper heated in a furnace after mixing with silica?
Write down the reactions taking place in Blast furnace related to the metallurgy of iron in the temperature range 500-800 K.
Explain the following:
\[\ce{CO2}\] is a better reducing agent below 710 K whereas \[\ce{CO}\] is a better reducing agent above 710 K.
Explain the following:
Silica is added to the sulphide ore of copper in the reverberatory furnace.
Explain the following:
Carbon and hydrogen are not used as reducing agents at high temperatures.
A cuprous ore among the following is:-
\[\ce{Au + CN^- + H2O + O2 -> [Au(CN)2]^- + OH^-}\]
The number of CN− ions involved in the balanced equation is ______.
