Question

few iodine crystals are kept in a conical flask, it is stoppered and kept undisturbed for a long time. A few crystals are seen near the mouth and sides of the flask. Explain​

Answer 1

Answer:

Iodine will sublimate. So some crystals will  have evaporated and have reached the mouth of the flask.

Explanation:

Answer 2

The reason is sublimation.

• Iodine crystals undergo sublimation.
• Sublimation is the conversion of a matter in a solid-state to a gaseous state without passing through the liquid state.
• Solid carbon dioxide or dry ice also exhibits sublimation.
• Iodine in crystal form undergoes sublimation.
• Iodine crystals in the presence of gas or oxygen overcome the force of attraction between the molecules,
• And it starts to move freely.
• These gas molecules escape from the conical flask and when it comes into contact with the cold surface of the conical flask it gets cooled to give the crystals.
• This is the reason for the observation.
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