Which of the following processes involves smelting?
(1) ZnCO3 —Heat—>  ZnO + CO2
(2) 2PbS + 3O2 —Heat—> 2PbO + 2SO2
(3) Al2O3·2H2O  —Heat—> Al2O3 + 2H2O
(4) Fe2O3 + 3C  —Heat—> 2Fe + 3CO

Answer: 4
Explanation: S
melting is a high-temperature process used to extract metals from their ores. In this particular reaction, iron(III) oxide (Fe2O3) is reduced by carbon (C) to produce metallic iron (Fe) and carbon monoxide (CO). The smelting process is commonly used in the extraction of iron from its ore, which is usually iron(III) oxide (Fe2O3) or hematite.

Please note that in above 3 cases (Option1, 2 and 3), no metal is getting extracted.

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