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The process which involves smelting is

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

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

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

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

answer is A.

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${Fe}_{2} O_{3} + 3 C \overset{Heat}{⟶} 2 Fe + 3 CO$ reaction involves smelting.

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