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

3 M n_{3} O_{4} + 8 A l ⟶ 9 M n + 4 A l_{2} O_{3}

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C r_{2} O_{3} + 2 A l ⟶ A l_{2} O_{3} + 2 C r

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2 F e + A l_{2} O_{3} ⟶ 2 A l + F e_{2} O_{3}

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B_{2} O_{3} + 2 A l ⟶ 2 B + A l_{2} O_{3}

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Solution

The correct options are
A $3 M n_{3} O_{4} + 8 A l ⟶ 9 M n + 4 A l_{2} O_{3}$
B $C r_{2} O_{3} + 2 A l ⟶ A l_{2} O_{3} + 2 C r$
D $B_{2} O_{3} + 2 A l ⟶ 2 B + A l_{2} O_{3}$
Thermite process is Reduction of metal oxides with aluminum powder in which a huge amount of heat is liberated is called thermite process.
In all the three options of A,B & D metal oxides are reduced by Aluminum powder but in option C metal is reduced with aluminum oxide.
Hence options A,B & D are correct.

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