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NDA 1 2024 GAT, question 105

Topic: Chemistry

Q105

Soap with water forms :

  1. (a) Metallotropic liquid crystal
  2. (b) Thermotropic liquid crystal
  3. (c) Homogeneous solution
  4. (d) Lyotropic liquid crystalCorrect answer

Solution.

Answer: (d) Lyotropic liquid crystal

  1. In water, soap molecules arrange themselves into ordered layers and rods whose structure depends on how much soap is present.
  2. A liquid crystal whose structure depends on concentration in a solvent is lyotropic; thermotropic ones depend on temperature.

Trap: A very dilute soap solution is not a liquid crystal; the question means soap mixed with water in normal proportions.