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Principles Related to Practical Chemistry · Question 55

JEE Main 2025 (Online) 28th January Evening ShiftMCQEasy📈 Topic in 39% papers+4−1
1

The purification method based on the following physical transformation is : (X)Solid Heat (X)Vapour Cool (X)Solid

  1. Extraction
  2. Crystallization
  3. Distillation
  4. Sublimation

Answer

(4) Sublimation

Solution

The solid X changes directly into vapour on heating and the vapour changes directly back into the solid on cooling, without passing through the liquid state.

As per NCERT, this is sublimation; it separates sublimable compounds (e.g. camphor, naphthalene, iodine) from non-sublimable impurities.

Answer: (4)

JEE Main 2025 (Online) 28th January Evening Shift

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2

Identify the inorganic sulphides that are yellow in colour : Choose the correct answer from the options given below :

  1. (D) and (E) only
  2. (A) and (B) only
  3. (A), (D) and (E) only
  4. (A) and (C) only
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