Question

On heating iodine and sand which will sublime?
A. Sand
B. Iodine
C. Both A and B
D. None of them

Answer 1

In the above question, it is asked among iodine and sand, which will sublimate. Sublimation is a process where the solid changes to gaseous state directly.

Complete step-by-step answer: We know that sublimation is the process of conversion of solid into gaseous state without undergoing liquid state.
Sand is the material which we use to see daily. Sand is kept under the sun. Even if it's winter or summer, it never sublimes and hence, sand can never undergo sublimation.
Iodine belongs to group 17 of the periodic table. It is the heaviest element which is easily sublime. And hence, iodine undergoes sublimation but sand does not.

Additional Information-
Iodine is an essential mineral which is commonly found in seafood. Our thyroid gland uses iodine to make thyroid hormones which helps in control growth, repair damaged cells and support a healthy metabolism.
Swelling in front of the neck is an indication of iodine deficiency. This is called goiter.
Unexpected weight gain and hair loss are also symptoms of iodine deficiency. A severe iodine deficiency results in abnormally slow heart rate. This can make us feel weak, fatigued, dizzy and in some cases, it may result in unconsciousness and people faints.

So, option B is the correct option.

Note: Van der Waals forces which link iodine molecules together in a crystal are relatively weak. Hence, iodine usually sublimes very easily without undergoing through the liquid state.