Question

Which of the following will exhibit sublimation? (a) Camphor (b) Sand (c) Salt (d) Sugar

Answer 1

Answer:

camphor

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Answer 2

Answer:

Camphor

Explanation:

List of Substances that undergoes sublimation

These are some common substances that undergo sublimation upon heating under the normal atmospheric pressure condition.

• dry ice (solid CO2, carbon dioxide)
• Ice & snow ( from Water )
• iodine crystals
• Naphthalene (mothballs)
• Camphor
• Caffeine ( under vacuum )
• Arsenic
• Phthalic Anhydride
• C60 (buckyballs) which sublimes at atmospheric pressure, but only at around 800 K.

* Ammonium chloride

But :

NH4Cl sublimates only in a normal way from gas to solid, in reverse it won’t do it at room temp, you need heat, and it will actually not just sublimate but will decompose ( into HCl & NH3 gas) but then recombines to NH4Cl ; so you can call it a pseudo sublimation.

E.g.: caffeine, extraction and sublimation, to purify :