Question

All decomposition reactions are endothermic.why

Answer 1

because to decompose means to break which is molecular bond so breaking always need energy so it is endothermic

Answer 2

here is u r answer
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decomposition reaction
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all decomposition reaction are endothermic reaction because in all decomposition reaction heat evolved and energy evolved.

and the endothermic reaction said to those reaction in which heat evolved and energy evolved.

it s ok