Which of the following processes releases heat? Evaporation Freezing Melting Sublimation. I know for sure it is not freezing.

Freezing process release heat that is the process is exothermic. In addition condensation process also is exothermic. When substance losses heat energy the attractive force between atom slow down and hence reduces their mobility. Example when water turn to a ice cubes the reaction releases heat energy.

During freezing heat will be released. Normally we wont think like that, but the reality is during freezing the heat get released. the liquid water will have more energy than the frozen water. so during this transition the energy of the water get released as the latent heat. Basically when we need to reduce the temperature ie. freezing a substance, the heat already absorbed in the substance should be released out of the substance.