Q.

The process which involves smelting is

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a

Fe2O3+3C⟶ Heat 2Fe+3CO

b

2PbS+3O2⟶ Heat 2PbO+2SO2

c

Al2O3⋅2H2O⟶ Heat Al2O3+2H2O

d

ZnCO3⟶ Heat ZnO+CO2

answer is A.

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Fe2O3+3C⟶ Heat 2Fe+3CO reaction involves smelting.
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The process which involves smelting is