Question

Which one of these does not sublime on heating?
A. Ammonium Chloride
B. Naphthalene
C. Camphor
D. Calcium carbonate

Answer 1

Hint: Sublime is the process to convert (a solid substance) by heat into a vapour, which on cooling condenses again to solid form, without apparent liquefaction. Chemists employ the method of sublimation to purify substances. A solid is typically heated under vacuum in sublimation equipment.

Complete answer:
Calcium carbonate does not sublimate on heating.Ammonium chloride changes from a solid to a gas when heated. The gaseous form of ammonium chloride can be easily cooled to yield a pure solid. Examples include camphor, naphthalene, anthracene, iodine, and other sublime compounds.

Calcium carbonate is a substance with the chemical formula as $CaC{O_3}$. It is generally found in the form of mineral calcite and aragonite and is also the primary component of the eggshells, snail shells, snail shells, and pearls. Limestone is the most commonly used pearl which is also a form of sedimentary rock consisting primarily of calcite. The active element in agricultural lime is calcium carbonate, which is formed when calcium ions in hard water combine with carbonate ions to form limescale.

It's used in medicine as a calcium supplement or an antacid, but too much of it can lead to hypercalcemia and intestinal problems.Mining or quarrying is used to extract the vast majority of calcium carbonate utilised in industry. From a pure quarry source, pure calcium carbonate (for culinary or pharmaceutical purposes) can be made (usually marble).

Hence, the correct option is (D) Calcium carbonate.

Note: The ionic solid sodium chloride has a high melting and boiling point. As a result, it cannot shift to the vapour phase simply by applying gas pressure, and so cannot sublime. Sublimation occurs when ammonium chloride, solid, and iodine are heated without first becoming liquid and then converting to a gaseous form.