The van't Hoff factor i for a compound which undergoes dissociation i...
In case of association of solute particles in solution, the observed molecular weight of solute being more than the normal, the value of factor 'i' is less than unity (i.e. i < 1),="" while="" for="" dissociation,="" the="" value="" of="" i="" is="" greater="" than="" unity="" (i.e.="" i="" /> 1), because the observed molecular weight has lesser value than normal molecular weight.
The van't Hoff factor i for a compound which undergoes dissociation i...
Explanation:
Dissociation and Association in Different Solvents:
When a compound undergoes dissociation in one solvent and association in another solvent, the van't Hoff factor (i) will vary depending on the solvent in which the compound is dissolved.
Van't Hoff Factor:
The van't Hoff factor (i) is the ratio of the actual concentration of particles produced when a substance is dissolved in a solution to the concentration of a substance as calculated from its mass. It takes into account the extent of dissociation or association of a compound in a solution.
Case Scenario:
In the given scenario, the compound dissociates in one solvent, leading to an increase in the number of particles in solution, resulting in the van't Hoff factor being greater than one. On the other hand, when the same compound undergoes association in a different solvent, it leads to a decrease in the number of particles in solution, resulting in the van't Hoff factor being less than one.
Therefore, for a compound that undergoes dissociation in one solvent and association in another solvent, the van't Hoff factor will be greater than one in the solvent where dissociation occurs and less than one in the solvent where association occurs.
Therefore, the correct answer is option D, where the van't Hoff factor is greater than one in the solvent where dissociation occurs and less than one in the solvent where association occurs.
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