Question

When a_ ( sublimes, a converts to a_ (ii) This phase change is_ because energy is_(iv) when the intermolecular forces_ [M]__ (i) (ii) (iii) (iv) (v) a. solid Liquid endothermic absorbed form b. solid Gas endothermic absorbed break c. solid Liquid exothermic released break solid Gas exothermic released form e gas Solid exothermic released form d

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

Sublimation is defined as the process in which a solid substance changes directly into gaseous phase without undergoing into liquid phase.

For example, when naphthalene balls are kept in a trunk or cupboard then after some days or months it changes into gas. Hence, they become consumed.

Also during this process energy is being absorbed by the solid substance because for breaking bonds energy is always absorbed by a substance. Only then it can change into liquid or vapor state.

So, a chemical process in which energy is being absorbed by a reaction is known as endothermic reaction. And, if heat energy is being released by the reaction then it is known as an exothermic reaction.

Therefore, we can conclude that when a solid sublimes, a solid converts to a gas. This phase change is endothermic because energy is absorbed when the intermolecular forces break.