(C) The given reaction is: $8 \ Al + 3 \ Fe_3O_4 \to 4 \ Al_2O_3 + 9 \ Fe$In this reaction,$Al$ is the reducing agent (reductant) as its oxidation sta

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(C) The given reaction is: $8 \ Al + 3 \ Fe_3O_4 \to 4 \ Al_2O_3 + 9 \ Fe$In this reaction,$Al$ is the reducing agent (reductant) as its oxidation state changes from $0$ to $+3$.The change in oxidation number for one atom of $Al$ is $|3 - 0| = 3$.Therefore,the number of moles of electrons transferred by $1 \ mol$ of $Al$ is $3$.