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1. Solution and colligative properties — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 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.
  • ✓
    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

Correct option: B.
the forces of attractions between like molecules are smaller than those between unlike molecules.
b
Raoult's law holds over the entire concentration range $x =0$ to $1$ in a binary solution then, for the second component, the same must also hold.

If deviations from the ideal are not too large, Raoult's law is still valid in a narrow concentration range when approaching $x=1$. for the majority phase (the solvent) The solute also shows a linear limiting law, but with a different coefficient. This law is known as Henry's Law.

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