Which among the following is a heterogeneous mixture ?

Options

A. Soda water
B. Liquid ammonia
C. Milk
D. Sugar water

Explanation

To determine which among the given options is a heterogeneous mixture, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Mixtures**:
- Mixtures can be classified into two types: homogeneous and heterogeneous.
- A homogeneous mixture appears uniform and the components are not distinguishable. Examples include sugar dissolved in water (sugar water) and soda water.
- A heterogeneous mixture has distinct components that can be seen and separated. Examples include salad or a mixture of sand and iron filings.

2. **Analyze the Options**:
- **Option 1: Soda Water**: This is a homogeneous mixture because the carbon dioxide gas is dissolved in water, and it appears uniform.
- **Option 2: Liquid Ammonia (NH3)**: This is also a homogeneous mixture as it consists of nitrogen and hydrogen bonded together, appearing as a single substance.
- **Option 3: Milk**: This is a heterogeneous mixture because it contains fat globules, proteins, and water, which can be seen under a microscope as distinct components.
- **Option 4: Sugar Water**: This is a homogeneous mixture because the sugar completely dissolves in water, creating a uniform solution.

3. **Identify the Heterogeneous Mixture**:
- From the analysis, the only option that qualifies as a heterogeneous mixture is **Milk**.

### Conclusion:
The correct answer is **Milk**, as it is a heterogeneous mixture.

---