- The thermite reaction involves the reduction of a metal oxide by a more reactive metal, producing a large amount of heat and molten metal. - The specific reaction used for rail welding is between iron(III) oxide (Fe₂O₃) and aluminium (Al): 2Al + Fe₂O₃ → Al₂O₃ + 2Fe + Heat. - The molten iron produced at high temperature fills the gap between the rails, creating a weld.
In the joining of railway tracks, iron oxide is made to react with
Asked in UPSC CDS 2 2022 · Topic: Metals, Minerals, Ores: Properties, Uses (Extraction of metals from concentrated ores (roasting, calcination, smelting, electrolytic reduction))
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