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प्रश्न
Write down the reaction taking place in blast furnace related to the metallurgy of iron in the temperature rnge 500 K – 800 K. What is the role of limestone in the metallurgy of iron?
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उत्तर
Reaction in blast firnace during metallurgy of Fe at 500 K – 800 K involves.
3Fe2O3 + CO → 2Fe3O4 + CO2
3Fe2O4 + 4CO → 3Fe + 4CO2
Fe2O4 + CO → 2FeO + CO2
Reduction of iron oxides takes place. Limestone is added, during metallurgy as it decomposes to CaO at high temperature in funace.
\[\ce{ CaCO3{(s)} ->[\Delta]} CaO(s) + CO{2(g)}\]
Calcium oxide removes silicate impurity of ore as slag. Slag in molten state floats on molten iron metal, hence can be easily removed.
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संबंधित प्रश्न
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In the extraction of chlorine from brine:
(i) ∆GΘ for the overall reaction is negative.
(ii) ∆GΘ for the overall reaction is positive.
(iii) EΘ for overall reaction has negative value.
(iv) EΘ for overall reaction has positive value.
Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.
Match the items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Coloured bands | (1) Zone refining |
| (B) Impure metal to volatile complex | (2) Fractional distillation |
| (C) Purification of Ge and Si | (3) Mond Process |
| (D) Purification of mercury | (4) Chromatography |
| (5) Liquation |
Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
