Which of the following oxides shows electrical properties like metals ?

Options

A. `SiO_2`
B. MgO
C. `SP_(2(s))`
D. `CrO_2`

Answer

To determine which of the following oxides shows electrical properties like metals, we need to analyze the electrical conductivity of each oxide mentioned. The oxides in question are silicon dioxide, sulfur dioxide, magnesium oxide, and chromium dioxide.

### Step-by-Step Solution:

1. **Identify the Oxides**: The oxides we need to analyze are:
- Silicon dioxide (SiO₂)
- Sulfur dioxide (SO₂)
- Magnesium oxide (MgO)
- Chromium dioxide (CrO₂)

2. **Analyze Silicon Dioxide (SiO₂)**:
- Silicon dioxide is known to be a semiconductor.
- At room temperature, it does not conduct electricity well unless external heat or energy is supplied to excite the electrons.

**Hint**: Remember that semiconductors require energy to conduct electricity.

3. **Analyze Sulfur Dioxide (SO₂)**:
- Sulfur dioxide is an oxide of a non-metal and behaves as an insulator.
- It does not conduct electricity because there are no free-moving electrons.

**Hint**: Non-metals typically do not conduct electricity due to the lack of free electrons.

4. **Analyze Magnesium Oxide (MgO)**:
- Magnesium oxide is a crystalline solid where electrons are tightly bound to the magnesium and oxygen ions.
- Because of this tight binding, it does not conduct electricity at room temperature.

**Hint**: Crystalline solids with tightly bound electrons usually act as insulators.

5. **Analyze Chromium Dioxide (CrO₂)**:
- Chromium dioxide exhibits metallic properties and has a higher conductivity at room temperature.
- It has a strong metallic bond and free-moving electrons, similar to metals, which allows it to conduct electricity effectively.

**Hint**: Look for oxides that have metallic characteristics, as they are more likely to conduct electricity.

6. **Conclusion**:
- Among the oxides analyzed, only chromium dioxide (CrO₂) shows electrical properties similar to metals due to its ability to conduct electricity at room temperature.

### Final Answer:
The oxide that shows electrical properties like metals is **chromium dioxide (CrO₂)**.