The smelting of Zinc Oxide (obtained from roasted ZnS) happens __ the boiling point of Zinc metal

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Solution

Zinc boils at $920^{0} C$ and the smelting happens at a significantly higher $1300^{0} C$ . This is because of the following side reaction during smelting:

$C O_{2} (g) + C$ $\to$ $2 C O (g) △ H > 0$ endothermic

This reaction lowers the temperature thus impeding the vapourization (of Zinc)

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