A mixture of iron filings and sand can be separated by

Options

A. Heating
B. Sublimation
C. Hand picking
D. Magnetic separation

Answer

To separate a mixture of iron filings and sand, we can use the following method:

### Step-by-Step Solution:

1. **Identify the Components**:
- The mixture consists of iron filings and sand.
- Iron filings are magnetic, while sand is not.

**Hint**: Look for properties of the substances in the mixture, such as magnetism.

2. **Choose the Separation Method**:
- Since iron filings are magnetic, we can use the **magnetic separation method** to separate them from sand.

**Hint**: Consider methods that utilize the physical properties of the components in the mixture.

3. **Gather Materials**:
- You will need a strong magnet and a container (like a beaker) to hold the mixture.

**Hint**: Ensure you have the right tools that can help you apply the chosen method effectively.

4. **Perform the Separation**:
- Bring the magnet close to the mixture of iron filings and sand.
- The iron filings will be attracted to the magnet and will stick to it, while the sand will remain in the container.

**Hint**: Think about how the properties of the materials interact with the magnet.

5. **Collect the Separated Components**:
- Once the iron filings are attracted to the magnet, you can remove the magnet from the mixture.
- The sand will be left behind in the container, effectively separating the two components.

**Hint**: Make sure to handle the magnet carefully to avoid losing any of the separated materials.

### Final Answer:
The mixture of iron filings and sand can be separated by the **magnetic separation method**.