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Explain thermit reaction and give its us...

Explain thermit reaction and give its uses.

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i.Reduction of iron (lll) oxide to iron by aluminium is called thermit reaction. The reaction is highly exothermic.
`underset"Iron (III) oxide" (Fe_2O_(3(s))) + underset"Aluminium"(2Al_((s))) overset"Ignited"to underset"Iron"(2Fe_((l))) + underset"Aluminium oxide"(Al_2O_(3_(s)))` + Heat
iii.This reaction is used to join railway tracks (welding rails) or cracked machine parts.
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