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Chemistry Question on General Principles and Processes of Isolation of Elements

In alumino thermite process which of the following is reduced :

A

Aluminium

B

Oxide

C

Sulphide

D

Carbonate

Answer

Oxide

Explanation

Solution

Aluminium has the power of displacing elements less electropositive than itself from their oxides as it has great affinity for oxygen at high temperature. The reaction being so strongly exothermic that the metal set free is obtained in the molten condition and it is protected from oxidation by a layer of fluid slag consisting of Al2O3 {Al2O3}. Oxide+Al−>Al2O3+metal⏟Molten state+heatenergy{Oxide + Al -> \underbrace{Al_2O_3 + metal}_{ Molten \, state } + heat energy }