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Question

Which of the following reaction is not involved in themite process?


A
3Mn3O4+8Al9Mn+4Al2O3
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B
Cr2O3+2AlAl2O3+2Cr
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C
2Fe+Al2O32Al+Fe2O3
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D
B2O3+2Al2B+Al2O3
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Solution

The correct option is C $$2Fe+{ Al }_{ 2 }{ O }_{ 3 }\longrightarrow 2Al+{ Fe }_{ 2 }{ O }_{ 3 }$$

Alumino thermite Process: is a process of Extracting metals by reduction of a metal oxide to form metal using aluminium powder , the Al acts as a reducing agent. It is an Exothermic Process which liberate large amount of heat. This method can be used to reduce all the metallic oxides, with oxide of magnesium being the only exception. 

Example:- Reduction of Ferrous oxide to Ferrous metal, Iron (II) oxide is mixed with Aluminium powder.

$$\mathrm{Fe}_{2} \mathrm{O}_{3}+2 \mathrm{Al} \longrightarrow 2 \mathrm{Fe}+\mathrm{Al}_{2} \mathrm{O}_{3}+\mathrm{Heat}$$


Chemistry
NCERT
Standard XII

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