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

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

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

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

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B_{2} O_{3} + 2 A l \to 2 B + A l_{2} O_{3}

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Solution

The correct option is C $2 F e + A l_{2} O_{3} \to 2 A l + F e_{2} O_{3}$
In thermite process, aluminium is used to reduce certain metal oxides such as $F e_{2} O_{3}$ and $C r_{2} O_{3}$ to the corresponding metals. Following are the examples:
$3 M n_{3} O_{4} + 8 A l \to 9 M n + 4 A l_{2} O_{3}$
$C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r$
$B_{2} O_{3} + 2 A l \to 2 B + A l_{2} O_{3}$
However the following reation is not the reduction of metal oxide to metal. Hence, it does not occur in the thermite process.
$2 F e + A l_{2} O_{3} \to 2 A l + F e_{2} O_{3}$

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A l_{2} O_{3}

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