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 A $2 F e + A l_{2} O_{3} \to 2 A l + F e_{2} O_{3}$
In alumonithermy or thermite process, aluminium is used to reduce certain metal oxides such as $F e_{2} O_{3}$ and $C r_{2} O_{5}$ 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 reaction 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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Similar questions

10 g

A l

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

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

A l_{2} O_{3}

C r_{2} O_{3}

F e_{2} O_{3}

- 1676 k J

- 1141 k J

- 822.2 k J

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

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

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

A l_{2} O_{3}

C r_{2} O_{3}

Δ H

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

The enthalpies of formation of $A l_{2} O_{3}$ and $C r_{2} O_{3}$ are $- 1569 K J$ and $- 1134 K J$ respectively. $Δ H$ for the reaction

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

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