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Isolation of Elements question

2025 · 28 Jan · Shift 2 · Q14
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  5. /2025 · 28 Jan · Shift 2 · Q14

Isolation of Elements question

2025 · 28 Jan · Shift 2 · Q14

JEE MainChemistryIsolation of ElementsMCQ+4 / −1
The purification method based on the following physical transformation is :  Solid (X)→ Heat  Vapour (X)→ Cool  Solid (X)\underset{(X)}{\text { Solid }} \xrightarrow[]{\text { Heat }} \underset{(X)}{\text { Vapour }} \xrightarrow{\text { Cool }} \underset{(X)}{\text { Solid }}(X) Solid ​ Heat ​(X) Vapour ​ Cool ​(X) Solid ​
  1. A
    Extraction
  2. B
    Crystallization
  3. C
    Distillation
  4. D
    Sublimation
View written solutionFree

Correct answer: D

  1. We are given the physical transformation:

Solid→HeatVapour→CoolSolid\text{Solid} \xrightarrow{\text{Heat}} \text{Vapour} \xrightarrow{\text{Cool}} \text{Solid}SolidHeat​VapourCool​Solid

  1. This means the substance changes directly from solid to vapour on heating, and then from vapour back to solid on cooling.

  2. Such a process is called sublimation.

  3. In purification, sublimation is used for substances that sublime on heating, leaving non-volatile impurities behind.

  4. Now check the options:

  • A: Extraction — not this process.
  • B: Crystallization — involves formation of crystals from solution, not solid →\to→ vapour →\to→ solid.
  • C: Distillation — involves liquid →\to→ vapour →\to→ liquid.
  • D: Sublimation — exactly matches solid →\to→ vapour →\to→ solid.

Hence, the correct answer is:

D: Sublimation\boxed{\text{D: Sublimation}}D: Sublimation​