Why are decomposition reaction called the opposite of combination reaction?
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a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.
CaCO3 (s) ⇨ CaO (s) + CO2 (g) Decomposition reaction
H2 (g) + Cl2 ⇨ 2HCl (g) Combination reaction
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In decomposition reactions, a substance breaks up into its constituent elements or compounds but in combination reaction, two or more substance react to form a single substance. Hence decomposition reactions are opposite of combination reaction.
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