van't Hoff factor more than unity indicates that the solute in solution has

Options

A. dissociated
B. associated
C. both (a) and (b)
D. cannot say anything

Explanation

To solve the question regarding the van't Hoff factor and its implications for solutes in solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the van't Hoff Factor (i)**: The van't Hoff factor (i) is a measure of the number of particles a solute produces in solution. It is defined as the ratio of the number of particles in solution after dissociation or association to the number of formula units initially dissolved.

2. **Identify the Meaning of i > 1**: When the van't Hoff factor is greater than 1 (i > 1), it indicates that the solute is dissociating into multiple particles in solution. This means that one formula unit of the solute produces more than one particle.

3. **Example of Dissociation**: A common example of a solute that dissociates is sodium chloride (NaCl). When NaCl is dissolved in water, it dissociates into sodium ions (Na⁺) and chloride ions (Cl⁻). Thus, one formula unit of NaCl produces two ions:
- NaCl → Na⁺ + Cl⁻
- Here, the van't Hoff factor (i) is 2, which is greater than 1.

4. **Conclusion**: Therefore, if the van't Hoff factor is more than unity, it indicates that the solute in the solution is dissociated into multiple particles.

### Final Answer:
The van't Hoff factor more than unity indicates that the solute in solution has dissociated.

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