Solid-state reactions can involve exothermic or endothermic processes, with moisture loss being a separate aspect of the reaction.
Decomposition of solid is endothermic process because it involves absorbing energy from the surroundings, like in the process of melting ice. On the other hand, decomposition of solid is exothermic process releases energy, like in combustion reactions. Moisture loss can be determined in solid-state reactions but is not directly related to the endo/exothermic nature of the decomposition.
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