Question

1.a) Decomposition reaction is reverse of combination. Justify by giving suitable examples.​

Answer 1

Answer:

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.

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Answer 2

Explanation:

Decomposition reactions are those in which a compound breaks down to form two or more substances. These reactions require a source of energy to proceed. Thus , they are the exact opposite of combination reaction in which two or more substances combine to give a new substance with the release of energy .

Decomposition reaction : AB + Energy = A+ B

2H2O (l) electrolysis = 2H2 (g) + O2 (g)

Combination reaction: A+ B = AB + Energy

2H2O (g) + O2 = 2H2O (l) + Energy