Why decomposition reaction are called the opposite of combination reac

1.	Why decomposition reaction are called the opposite of combination reaction? Explain with example
Answer» as decomposition reaction is that reaction in which a substance gets split into 2 elements or compound but in combination reaction 2 elements or compound combine to form a substance.eg of decomposition reaction is CaCO3--CaO+CO2 and of combination reaction is Mg+O2--MgO Exthothermi

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