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Solutions — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistrySolutions1 Mark
MCQ
Raoult's law is obeyed by each constituent of a binary liquid solution when:
  • A
    The forces of attractions between like molecules are greater than those between unlike molecules.
  • B
    The forces of attractions between like molecules are smaller than those between unlike molecules.
  • C
    The forces of attractions between like molecules are identical with those between unlike molecules.
  • D
    The volume occupied by unlike molecules are different.
✓

Answer

  1. The forces of attractions between like molecules are identical with those between unlike molecules.

Explanation:

When the forces of attractions between like molecules are identical with those between unlike molecules, Raoult's law is obeyed by each constituent of a binary liquid solution.

In such case, the total vapour pressure of the solution is the sum of the partial vapour pressures of components of the solution.

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