NEET 2024 · ChemistryPrevious Year Question
On heating, some solid substances change from the solid to the vapour state without passing through the liquid state. The technique used for the purification of such substances based on the above principle is known as:
Answer: (A) Sublimation. \textbf{Answer:} (a) \textbf{Solution:} Sublimation is the direct solid-to-vapour conversion (and re-deposition on cooling) without an intervening liquid phase.
- A.Sublimation✓
- B.Distillation
- C.Chromatography
- D.Crystallization
Correct Answer
(A) Sublimation
Solution & Explanation
\textbf{Answer:} (a) \textbf{Solution:} Sublimation is the direct solid-to-vapour conversion (and re-deposition on cooling) without an intervening liquid phase. It is used to purify solids that sublime, such as camphor, naphthalene and benzoic acid, by separating them from non-volatile impurities.
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