Difficult
Which of the following processes involves smelting?
- A$ZnCO_3 \to ZnO + CO_2$
- B$Fe_2O_3 + 3C \to 2Fe + 3CO$
- C$2PbS + 3O_2 \to 2PbO + 2SO_2$
- D$Al_2O_3 \cdot 2H_2O \to Al_2O_3 + 2H_2O$
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