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CaCO3, calcium carbonate can be either a reactant or a product. If it comes at the beginning of a reaction, then it is a reactant. If it comes at the end of the reaction, then it is a product.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoRedox reactions are those in which atoms have their formal oxidation states changed.
In that reaction, the oxygens all stay at -2, the carbon stays at +4, and the calcium stays at +2. So it's not a redox reaction, it's more of a rearrangement of atoms.
Wiki User
∙ 13y agoIt is a reduction reaction as adding CaCO3 and HCl together makes CaCl2 + CO2 + H2O therefore you have reduced the CaCO3's oxygen into CO2 and H2O
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