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Reaction(s) involved in thermite process is/are :

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$3 {Mn}_{3} O_{4} + 8 Al \to 9 Mn + 4 {Al}_{2} O_{3}$

${Cr}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Cr$

$2 Fe + {Al}_{2} O_{3} \to 2 Al + {Fe}_{2} O_{3}$

Both 1 and 2

answer is D.

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Detailed Solution

Alumino thermite is a process used to extract metals. In this process, metal oxide is reduced using aluminum powder, where aluminum acts as a reducing agent. A large amount of heat is released during the process, thereby it is an exothermic process.

Among the given options, A and B reaction take place in thermite process because Al powder is used of the reduction of metal oxide.

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