(a) Displacement reaction
(b) Decomposition reaction
(c) Combination reaction
(d) Double displacement reaction
Explanation: In this reaction, calcium carbonate breaks down into two simpler substances calcium oxide and carbon dioxide gas.
`CaCO_3 \to CaO + CO_2`
Decomposition reactions involve a single complex substance breaking down into two or more products in the presence of energy (heat, light, or electricity).
In the given reaction calcium carbonate is heated which leads to decomposition.
Correct answer - (b)
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