Question

Why decomposition rxns are generally endothermic .

Answer 1

Most decomposition reactions require energy either in the form of heat, light or electricity. Energy absorption causes breaking of bonds in reacting substance which decomposes to give the product. ... But no one ever discovered a law that decides if adecomposition reaction is exothermic or endothermic.

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Answer 2

The decomposition reaction is generally exothermic because they are carried out by applying heat,light or electricity and provide energy which breaks a compound into two or more simpler compound same as exothermic reaction.