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Why are Decomposition Reactions called the opposite of Combination Reaction? Write equations for these reactions.

Why are decomposition reactions opposite to combination reactions? Write equations for both with explanation for CBSE Class 10 Chemistry.

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Answer: Two or more compounds are mixed to produce a new substance in a combination reaction, whereas one material decomposes into two or more components in a decomposition reaction. As a result, decomposition reactions are referred to as the polar opposites of combination reactions.

Reaction of decomposition 

CaCO3 (s) -> CaO (s) + CO2 (g) (decomposition reaction)

H2 (g) + Cl2 -> 2HCl (g) (combination reaction) 

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