An inorganic salt solution paires on treatment with HCI will not give a white precipitate of which metal ions?

Options

A. `Hg_(2)^(2+)`
B. `Hg^(2+)`
C. `Zn^(2+)`
D. `Al^(3+)`

Explanation

To solve the question regarding which metal ions will not give a white precipitate when treated with HCl, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reaction**: When metal ions are treated with hydrochloric acid (HCl), they can react with chloride ions (Cl⁻) to form metal chlorides. Some of these metal chlorides are insoluble in water and will precipitate out as solids.

2. **Identify the Metal Ions**: The question implies that we need to consider several metal ions. Common metal ions that may be tested include Hg²⁺ (mercury), Zn²⁺ (zinc), and Al³⁺ (aluminum).

3. **Check Precipitation Behavior**:
- **Hg²⁺ (Mercury)**: When Hg²⁺ reacts with Cl⁻ from HCl, it forms Hg₂Cl₂ (mercurous chloride), which is a white precipitate.
- **Zn²⁺ (Zinc)**: Zn²⁺ forms ZnCl₂, which is soluble in water and does not precipitate.
- **Al³⁺ (Aluminum)**: Al³⁺ forms AlCl₃, which is also soluble in water and does not precipitate.
- **Other Ions**: We can also consider other metal ions, but based on the question, we focus on the ones mentioned.

4. **Conclusion**: Based on the above reactions, Hg²⁺ is the only cation that forms a white precipitate (Hg₂Cl₂) when treated with HCl. Therefore, the metal ions that will **not** give a white precipitate are Zn²⁺ and Al³⁺.

5. **Final Answer**: The metal ions that will not give a white precipitate upon treatment with HCl are Zn²⁺ and Al³⁺.