Carbon reduction method is employed for commercial extraction of :

haematite

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cassiterite

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iron pyrite

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corundum

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Solution

The correct options are
A haematite
B cassiterite
In extraction of tin from cassiterite-
$S n O_{2} + 2 C \to S n + 2 C O$
In extraction of iron from haematite -
$F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$
Iron pyrite $F e S_{2}$ is a sulphide ore for which froth floatation method is used.
Corundum is a crystalline form of aluminium oxide $A l_{2} O_{3}$ with traces of iron, titanium and chromium; for which electrolytic reduction method is used.

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