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Why are decompositon reactions called op...

Why are decompositon reactions called opposite of combination reactions?write equations for these reactions

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Decomposition reactions are those reaction which a compound is broken into two or more compounds.
`CaCO_3 overset("heat")(rarr) CaO + CO_2`
Combination reactions are those reactions in which substances are combined to form a new substance.
`CaO + CO_2 to CaCO_3`
In above examples, both the reactions are same but s opposite directions, so decomposition reaction is called opposite of combination reaction.
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