The limestone used in the blast furnace during the extraction of iron I produces carbon dioxide II produces carbon monoxide III removes silica as a slagAI, II and IIIBI and III onlyCII and III onlyDIII only
Question
The limestone used in the blast furnace during the extraction of iron I produces carbon dioxide II produces carbon monoxide III removes silica as a slagAI, II and IIIBI and III onlyCII and III onlyDIII only
Solution
The correct answer is B. I and III only.
Explanation:
I. Produces carbon dioxide: This is true. In the blast furnace, limestone (calcium carbonate) is heated and decomposes to form calcium oxide and carbon dioxide.
II. Produces carbon monoxide: This is false. Limestone does not produce carbon monoxide in the blast furnace. Carbon monoxide is produced from the coke (carbon) in the furnace, not the limestone.
III. Removes silica as a slag: This is true. The calcium oxide produced from the limestone reacts with silica (impurity in the iron ore) to form calcium silicate, also known as slag. The slag is less dense than the molten iron and so floats on top of it, allowing it to be easily removed.
Similar Questions
Limestone is added to a blast furnace toAproduce carbon dioxideBproduce carbon monoxide Cremove slag from the iron ore Dremove silicon dioxide from the iron ore
What is the purpose of feeding a mixture of iron oxides with limestone into the blast furnace?1 mark To reduce the temperatureTo remove acidic impuritiesTo supply heatTo increase efficiency
ron ore contains iron(III) oxide, Fe 2 O3 . A blast furnace is used to extract iron from Fe 2 O3 .Equations for some of the reactions in the blast furnace are shown.equation 1 C + O2 → CO2equation 2 CaCO 3 → CaO + CO2equation 3 CaO + SiO2 → CaSiO3(a) Equation 1 shows the combustion of carbon in the blast furnace.(i) Name the substance which provides the carbon for this reaction........................................................................................................................................ [1](ii) State the purpose of the combustion of carbon in the blast furnace.
The reaction that does NOT take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is :Fe2O3+CO→2FeO+CO2FeO+CO→Fe+CO2C+CO2→2COCaO+SiO2→CaSiO3
How is this carbon dioxide converted into carbon monoxide in the blast furnace?
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