Question

write the chemical equation for the reduction of Cr2O3 by aluminothermic process

Answer 1

Cr2O3 + 2Al = Al2O3 + 2Cr

Answer 2

Answer : The balanced chemical equation is, $Cr_2O_3+2Al\rightarrow Al_2O_3+2Cr$

Explanation :

Alumino-thermite process : This process involves the reduction of metal oxide such as $Fe_2O_3,Cr_2O_3,Mn_3O_4,etc$ to metals with aluminium. A mixture of metal oxide and aluminium powder is called thermite.

In this process, a mixture of aluminium powder and chromate oxide called thermite is ignited in a closed crucible by inserting a burning magnesium ribbon into the ignition mixture consisting of magnesium powder and barium powder. The ignition powder burns to produce a large amount of heat needed to initiate the reaction.

The balanced chemical equation will be,

$Cr_2O_3+2Al\rightarrow Al_2O_3+2Cr$

This reaction is highly exothermic reaction.