A colloid always :

Options

A. Contains two distinct phases
B. Is a true solution
C. Contains three phases
D. Contains only water soluble particles

Answer

To solve the question "A colloid always:", we need to analyze the characteristics of colloids and evaluate the given options.

### Step-by-Step Solution:

1. **Understanding Colloids**:
- A colloid is a mixture where one substance (the dispersed phase) is evenly distributed throughout another substance (the dispersion medium).
- Colloids consist of two distinct phases: the dispersed phase and the dispersion medium.

2. **Evaluating the Options**:
- **Option 1: Contains two distinct phases**:
- This option is correct. A colloidal system has a dispersed phase and a dispersion medium, making it a two-phase system.

- **Option 2: Is a true solution**:
- This option is incorrect. A true solution is a homogeneous mixture where the solute is completely dissolved in the solvent, and it does not have distinct phases like a colloid.

- **Option 3: Contains three phases**:
- This option is also incorrect. A colloid only consists of two phases (dispersed phase and dispersion medium), not three.

- **Option 4: Contains only water-soluble particles**:
- This option is incorrect as well. Colloids can contain particles that are not necessarily water-soluble; they can be solid, liquid, or gas.

3. **Conclusion**:
- The only correct statement about colloids from the given options is that they contain two distinct phases.

### Final Answer:
A colloid always contains two distinct phases.

---