Van't Hoff factor i > 1 for a solute indicates
A{'text': 'Dimerisation of the solute', 'label': 'A'}
B{'text': 'Formation of a non-electrolyte', 'label': 'B'}
C{'text': 'Dissociation of the solute into ions', 'label': 'C'}
D{'text': 'A perfectly ideal solution', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Dissociation of the solute into ions', 'label': 'C'}
1. Van't Hoff factor i is the ratio of observed to calculated colligative effect.
2. i > 1 implies more particles than the formula suggests: dissociation.
3. Example: NaCl in water gives i ≈ 2 (near complete dissociation into Na⁺ and Cl⁻).
4. Dimerisation gives i < 1; ideal non-electrolyte gives i = 1.
_Source: NCERT Class 12 Chemistry, Unit 1 "Solutions", §1.7_
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