The purification method based on the following physical transformation is : textSolid xrightarrow[(textX)]textHeat textVapour xrightarrow[(textX)]textCool textSolid

Solution & Explanation

### Related Formula Direct phase transition without passing through an intermediate liquid phase defines sublimation: textSolid rightleftharpoons textVapour ### Core Logic The schematic diagram represents a solid turning directly into vapor on heating, which then reverts back to a solid phase upon cooling. This distinct behavior isolates sublimable solids from non-sublimable impurities. ### Step 1: Identification This transformation perfectly defines the laboratory purification process known as **Sublimation**. ### Pattern Recognition Look for the skipping of the liquid state entirely: Solid rightarrow Vapour rightarrow Solid. Common examples include camphor, naphthalene, benzoic acid, and iodine. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques

Reference Study Guides

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Q72 jee_main_2024_31_jan_morning Purification Methods
'Adsorption' principle is used for which of the following purification method?
  • A. textExtraction
  • B. textChromatography
  • C. textDistillation
  • D. textSublimation

Solution

### Core Logic The fundamental principle used in chromatography (such as column chromatography or thin-layer chromatography) is adsorption. Different components of a mixture are adsorbed to different extents on an adsorbent stationary phase. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques
Q80 jee_main_2024_31_jan_morning Purification Methods
Match List I with List II
LIST-I (Technique)LIST-II (Application)
A. DistillationI. Separation of glycerol from spent-lye
B. Fractional distillationII. Aniline - Water mixture
C. Steam distillationIII. Separation of crude oil fractions
D. Distillation under reduced pressureIV. Chloroform-Aniline
Choose the correct answer from the options given below:
  • A. textA-IV, B-I, C-II, D-III
  • B. textA-IV, B-III, C-II, D-I
  • C. textA-I, B-II, C-IV, D-III
  • D. textA-II, B-III, C-I, D-IV

Solution

### Core Logic (A) Simple distillation is used to separate a mixture of miscible liquids with a sufficiently large difference in their boiling points, such as chloroform and aniline. (A rightarrow IV) (B) Fractional distillation is used to separate crude oil fractions. (B rightarrow III) (C) Steam distillation is used to separate steam-volatile substances that are immiscible with water, like an aniline-water mixture. (C rightarrow II) (D) Distillation under reduced pressure is used for liquids that decompose at or below their normal boiling points, like separating glycerol from spent lye. (D rightarrow I) ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Organic Chemistry - Some Basic Principles and Techniques

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