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(A), (D)The important ore of tin is cassiterite (SnO2). Tin is extracted from cassiterite ore by carbon reduction method in a blast furnace.

$$SnO_2+ 2C \to Sn + 2CO$$

The product often contain traces of iron which is removed by blowing air through the melt to oxidize to FeO which then floats to the surface.

$$2Fe + O_2\to 2FeO$$

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