Solid carbon dioxide is an example of

Options

A. Metallic crystal
B. Covalent crystal
C. Molecular crystal
D. Ionic crystal

Answer

To solve the question "Solid carbon dioxide is an example of," we need to analyze the properties of solid carbon dioxide (CO₂) and categorize it correctly based on its structure and bonding.

### Step-by-Step Solution:

1. **Identify the Nature of Carbon Dioxide**:
- Carbon dioxide (CO₂) is a chemical compound composed of one carbon atom and two oxygen atoms. It is a linear molecule with a symmetrical arrangement.

**Hint**: Look at the molecular structure of CO₂ to determine its polarity.

2. **Determine Polarity**:
- The molecule has a symmetrical shape, which means that the dipoles (due to the difference in electronegativity between carbon and oxygen) cancel each other out. Therefore, CO₂ is classified as a non-polar molecule.

**Hint**: Consider how molecular geometry affects polarity.

3. **Classify the Solid State of CO₂**:
- When carbon dioxide is in its solid state (commonly known as dry ice), it forms a crystalline structure. Since CO₂ is a non-polar molecule, the solid form is categorized as a molecular crystal.

**Hint**: Recall the different types of crystalline solids: metallic, ionic, covalent, and molecular.

4. **Evaluate the Options**:
- **Option 1: Metallic crystal** - Incorrect, as CO₂ is not a metal.
- **Option 2: Covalent crystal** - Incorrect, as CO₂ does not form a network of covalent bonds like diamond or silicon.
- **Option 3: Molecular crystal** - Correct, as solid CO₂ is indeed a molecular crystal.
- **Option 4: Ionic crystal** - Incorrect, as CO₂ does not consist of ions.

**Hint**: Compare the characteristics of each type of crystal to CO₂.

5. **Conclusion**:
- Based on the analysis, solid carbon dioxide is best classified as a **non-polar molecular crystal**. Therefore, the correct answer is **Option 3**.

### Final Answer:
Solid carbon dioxide is an example of a **molecular crystal** (Option 3).