Reduction of a metal oxide by excess carbon at high temperature is a method for the commercial preparation of some metals. This method can be successfully applied in the case of :

B e O

and

A l_{2} O_{3}

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Z n O

and

F e_{2} O_{3}

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C a O

and

C r_{2} O_{3}

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B a O

and

U_{3} O_{8}

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Solution

The correct option is A $Z n O$ and $F e_{2} O_{3}$
Reduction of a metal oxide by excess carbon at high temperature is a method for the commercial preparation of $Z n O$ and $F e_{2} O_{3}$ . The process is called smelting and is used in pyrometallurgy.
$F e_{2} O_{3} + 3 C b l a s t f u r n a c e - ------ \to 2 F e + 3 C O$
$Z n O + C 1500 K - --- \to Z n + C O$

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F e_{2} O_{3}

C r_{2} O_{3}

850^{\circ}

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