Carbon reduction process is not commercially applicable for which of the following set of oxides to extract the respective metal?
(I) $Z n O$ (II) $F e_{2} O_{3}$ (III) $A l_{2} O_{3}$ (IV) $S n O_{2}$ (V) $M g O$

Z n O, F e_{2} O_{3}, S n O_{2}

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Z n O, S n O_{2}, M g O

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M g O, A l_{2} O_{3}

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M g O, S n O_{2}, A l_{2} O_{3}

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Solution

The correct option is C $M g O, A l_{2} O_{3}$
Carbon reduction process is used to reduce less electropositive metals. $M g$ and $A l$ have high electropositivity.

$M g O + C a t h i g h t e m p - ------ \to 2000^{0} C M g + C O$

It is possible at high temperatures, so it is not used for commercial purposes.

Hence, cannot be extracted from oxides through the carbon reduction process.

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