Question

Which one of the following does not undergo sublimation?
(a) iodine
(b) sodium chloride
(c) ammonium chloride
(d) none of these

Answer 1

Hint: Sublimation is a state in which a compound or a substance is converted directly from the solid-state to the gaseous state without having any intermediate state. Now, identify the compound which doesn’t form a gaseous state directly and you will get your answer.

Complete step by step answer:
First, let's discuss what sublimation is. By the term sublimation, we mean the process of conversion of the solid-state to the gaseous state.
- In other words, we can say that in this, the substances in solid-state directly change into the gaseous state without going through the intermediate state i.e. the liquid state.
Now considering the statement as;
- When iodine and the ammonium chloride in the solid-state are heated gently in the flame, it results in the formation of the fumes i.e. they directly convert from the solid-state to the gaseous state without forming any liquid.
- On the other hand, in the case of sodium chloride, it doesn’t form any fumes rather gets converted into the liquid form when heated gently i.e. it doesn’t convert from the solid-state to the gaseous state without forming the liquid. So, thus from the above all mentioned compounds, only sodium chloride doesn’t undergo sublimation.
So, the correct answer is “Option B”.

Note: Don’t get confused in the sublimation and the deposition. Sublimation is the process in which a solid changes directly into the gas or vapor without changing into the liquid whereas on the other hand, in case of deposition, a gas or vapor changes directly into the solid without changing into the liquid.