Which of the following metas displaces `SO_(2)` gas from concentrated sulphuric acid

Options

A. `Mg`
B. `Zn`
C. `Cu`
D. None of these

Explanation

To determine which metal displaces SO₂ gas from concentrated sulfuric acid (H₂SO₄), we can analyze the reactions of different metals with concentrated sulfuric acid.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Concentrated sulfuric acid can react with certain metals to produce metal sulfate, sulfur dioxide (SO₂), and water (H₂O).
- The general reaction can be represented as:
\[ \text{Metal} + \text{H}_2\text{SO}_4 \rightarrow \text{Metal Sulfate} + \text{SO}_2 + \text{H}_2\text{O} \]

2. **Identifying the Metals**:
- We need to evaluate the given options: Mg, Zn, Cu, and none of these.

3. **Testing Each Metal**:
- **Copper (Cu)**:
- When copper reacts with concentrated sulfuric acid, the reaction is:
\[ \text{Cu} + 2 \text{H}_2\text{SO}_4 \rightarrow \text{CuSO}_4 + \text{SO}_2 + 2 \text{H}_2\text{O} \]
- This reaction produces SO₂ gas, indicating that copper can displace SO₂ from concentrated sulfuric acid.

- **Zinc (Zn)**:
- Zinc also reacts with concentrated sulfuric acid, but the reaction primarily produces hydrogen gas rather than SO₂:
\[ \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \]
- Therefore, zinc does not displace SO₂.

- **Magnesium (Mg)**:
- Magnesium reacts with concentrated sulfuric acid to produce magnesium sulfate and hydrogen gas:
\[ \text{Mg} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2 \]
- Thus, magnesium does not displace SO₂.

4. **Conclusion**:
- Among the given options, only copper (Cu) can displace SO₂ gas from concentrated sulfuric acid.

### Final Answer:
The metal that displaces SO₂ gas from concentrated sulfuric acid is **Copper (Cu)**.