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The van't Hoff factor i for a compound which undergoes dissociation in one solvent and association in another solvent is respectively:

1. less than one and greater than one.
2. less than one and less than one.
3. greater than one and less than one.
4. greater than one and greater than one.

Correct answer: greater than one and less than one.

Solution

The van't Hoff factor i is the ratio of the actual number of particles in a solution to the number of particles in the pure solvent. When a compound dissociates, it produces more particles, so i is greater than one. However, when it associates, it produces fewer particles, so i is less than one.

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