Q.1.Why are decomposition reaction called the opposite of combination reaction?
Because in combination reaction two substance react together to form a single product but in decomposition it totally reverse in this reaction a subsrance decomposes into two or more than two substaces.
Combination reaction is that type of reaction in which two substance rea ct together to give single product. In decomposition reaction a substance decomposes into two or more than two substance.
In combination reac. Heat is produced where as in decomposition reac. Heat is absorbed
In a combination reaction two or mor substances combine to form a single a product. In decomposition reaction one compound split into two or more compounds in this reaction energy is absorbed in the form of heat, light and electricity