Question

what is thermit reaction ? Give chemical equation , explain how it is used to join railway tracks

Answer 1

The thermit reaction is the reaction of metal oxide with aluminium.The aluminium acts as a reducing element and the reaction is highly exothermic and hence called a thermite reaction.The aluminium reduces the oxide of another metal.Most of the it is Iron Oxide.The reaction can be shown as-

Fe2o3+Al=Fe+Al2O3

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Answer 2

The reaction of iron (III) oxide with aluminium to produce aluminium oxide and ferrous . Which is known as Thermite reaction . which is used to join the railway tracks which is known as thermite wielding  . The aluminium acts as reducing agent . Chemical equation given below shows the reaction = 

Fe2O3 + 2Al ------------> 2Fe + Al2O3 + heat 
this reaction is also called exothermic reaction because large amount of heat energy is elaborated. 

Hope this helps .