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Which of the following processes involve smelting?

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${ZnCO}_{3} \overset{Heat}{⟶} ZnO + {CO}_{2}$

$2 Pb + 3 O_{2} \overset{Heat}{⟶} 2 PbO + 2 {SO}_{2}$

${Al}_{2} O_{3} \cdot 2 H_{2} O \overset{Heat}{⟶} {Al}_{2} O_{3} + 2 H_{2} O$

${Fe}_{2} O_{3} + 3 C \overset{Heat}{⟶} 2 Fe + 3 CO$

answer is D.

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Detailed Solution

The processes involving smelting is ${Fe}_{2} O_{3} + 3 C \overset{Heat}{⟶} 2 Fe + 3 CO$ .

Smelting is used to describe the process of removing metal from its molten state using any reducing chemical when the flux is present.

It includes the reduction of oxides of less electro-positive metals like Pb, Zn, Fe, and Cu by any other reducing agents.

The reaction is as follows:

${Fe}_{2} O_{3} + 3 C \overset{Heat}{⟶} 2 Fe + 3 CO$

Hence, option D is correct.

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