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Extraction of metal from the ore cassiterite involves

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Extraction of metal from the ore cassiterite involves
A. Carbon reduction of an oxide ore
B. Self-reduction of sulphide ore
C. Removal of copper impurity
D. Removal of iron impurity
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Correct Answer - A::D
Cassiterite `(SnO_(2))` :
`{:(SnO_(2)+ C rarr SnO + CO),(SnO_(2) + C rarr Sn+ CO_(2)):}}"Carbon reduction"`
Also iron is present as impurity in this ore.
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