Which of the following metals react with chlorine to form their respective chlorides?

Options

A. Cu
B. Ag
C. Au
D. All

Answer

To solve the question of which metals react with chlorine to form their respective chlorides, we will analyze each metal provided in the options.

### Step-by-Step Solution:

1. **Identify the Metals**: The metals we need to consider are Copper (Cu), Silver (Ag), and Gold (Au).

2. **Copper (Cu)**:
- Copper reacts with chlorine gas (Cl₂) to form copper(II) chloride (CuCl₂).
- The reaction can be written as:
\[ 2 \text{Cu} + \text{Cl}_2 \rightarrow 2 \text{CuCl}_2 \]
- Therefore, Copper does react with chlorine to form its chloride.

3. **Silver (Ag)**:
- Silver reacts with chlorine to form silver(I) chloride (AgCl).
- The reaction can be represented as:
\[ \text{Ag} + \frac{1}{2} \text{Cl}_2 \rightarrow \text{AgCl} \]
- Hence, Silver also reacts with chlorine to form its chloride.

4. **Gold (Au)**:
- Gold can react with chlorine to form gold(III) chloride (AuCl₃).
- The balanced reaction is:
\[ 2 \text{Au} + 3 \text{Cl}_2 \rightarrow 2 \text{AuCl}_3 \]
- Thus, Gold reacts with chlorine to form its chloride as well.

5. **Conclusion**:
- All the metals listed (Copper, Silver, and Gold) react with chlorine to form their respective chlorides. Therefore, the answer is **D. All**.