Select the correct statement(s).
I. A solution in which size of the solute particles is about `10^(-10)` m, is called true solution. II. A solution which contains maximum possible amount of solute at any given temperature is called a saturated solution. III. In suspension, the size of particles is of the order of 10-7 m or larger. IV. A colloid is a heterogeneous system.

Options

A. I and II only
B. III and IV only
C. I, III and IV only
D. I, II, III and IV

Answer

To determine which statements are correct, let's analyze each statement one by one.

### Step 1: Analyze Statement I
**Statement I:** A solution in which the size of the solute particles is about `10^(-10)` m, is called a true solution.

**Analysis:** True solutions have solute particles that are typically smaller than `1 nm` (or `10^(-9)` m). The size mentioned here (`10^(-10)` m) falls within this range, confirming that this statement is true.

### Step 2: Analyze Statement II
**Statement II:** A solution which contains the maximum possible amount of solute at any given temperature is called a saturated solution.

**Analysis:** This statement accurately describes a saturated solution. A saturated solution is indeed one that contains the maximum concentration of solute that can dissolve in a solvent at a specific temperature. Therefore, this statement is also true.

### Step 3: Analyze Statement III
**Statement III:** In suspension, the size of particles is of the order of `10^(-7)` m or larger.

**Analysis:** Suspensions contain larger particles, typically greater than `1 µm` (or `10^(-6)` m). The size mentioned in the statement (`10^(-7)` m) is smaller than what is typically found in suspensions. Thus, this statement is false.

### Step 4: Analyze Statement IV
**Statement IV:** A colloid is a heterogeneous system.

**Analysis:** Colloids consist of two phases: a dispersed phase and a continuous phase (dispersion medium). This characteristic makes colloids heterogeneous systems. Therefore, this statement is true.

### Conclusion
Based on the analysis:
- **Statement I:** True
- **Statement II:** True
- **Statement III:** False
- **Statement IV:** True

The correct statements are I, II, and IV.