Compound X and aluminium are used to join railway tracks. (a) Identify the compound X (b) Name the reaction (c) Write down its reaction.


Compound X is Fe2O3.

The involved reaction is a thermite reaction which is also called as aluminothermy.

Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(s) + Heat

Ferric oxide + Aluminium → Aluminium + Iron Oxide.

Thermite reaction

The thermite reaction is an exothermic reaction between the metal and metal oxide. For example the reaction between the aluminium with the metal oxides, where aluminium acts as a reducing agent. The aluminium reduces the metal oxide most probably an iron (lll) oxide to produce ferrous and aluminium oxide. During the reaction, large amount of energy is released.

Fe2O3 + 2Al → 2Fe + Al2O3 + heat

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