Question

why are decomposition reaction called the opposite of combination reaction ?write equation for this reaction.​

Answer 1

In 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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Answer 2

this is so because in decomposition reaction a substance get split into two or more new substance but whereas in
in combination reaction two or more substance combine to form a new substance therefore, decomposition reaction is called just opposite of combination reaction .

e.g decomposition reaction

2H20- 2h2+o2 (in the presence of electricity)

combination reaction

H2+o2--- h2o

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