Give one example each when van't Hoff factor is 2 and `(1)/(2)`.

Explanation

To solve the question of providing examples for when the van't Hoff factor (i) is 2 and (1/2), we can follow these steps:

### Step 1: Understanding the van't Hoff factor (i)
The van't Hoff factor (i) is defined as the number of particles into which a solute dissociates in solution. It is calculated as the ratio of the actual number of particles in solution to the number of formula units of solute initially dissolved.

### Step 2: Example when i = 2
A common example of a solute that has a van't Hoff factor of 2 is potassium chloride (KCl). When KCl dissolves in water, it dissociates into two ions:
- KCl → K⁺ + Cl⁻
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