Question

which of the following is endothermic process evaporation and sublimation, photosynthesis and melting, bond dissociation and atomization, all of these (also give reason)​

Answer 1

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Explanation:

Sublimation of ice is a direct phase transition from solid to gas without passing through an intermediate liquid state. The process requires additional energy, therefore, it is an endothermic reaction and the amount of heat absorbed is called heat of sublimation.

[S]

heat

[V] ........Sublimation

Evaporation is the process in which water changes from liquid to gas or vapour. This endothermic process occurs with the absorption of heat and the rate of evaporation increases with increase in temperature.

[L]

heat

[V] .........Evaporation