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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

How many of the following compounds, when contaminated with non-volatile impurities, can be purified by sublimation: benzoic acid, naphthalene, anthracene, camphor, urea, sodium chloride?

Answer: 4

Solution

Naphthalene, camphor, anthracene and benzoic acid are classic molecular solids that sublime cleanly under laboratory conditions and are standard textbook examples purified this way. Urea, while it can sublime

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Question ID VK-140479