Q.
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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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