Which of the following halides are not soluble in water ?

Options

A. `AgCl`
B. `AgBr`
C. `PbCI_(2)`
D. `AgF`

Answer

To determine which halides are not soluble in water, we need to analyze the solubility of the given halides based on their ionic or covalent nature. Here’s a step-by-step solution:

### Step 1: Identify the Halides
The halides mentioned in the question are:
1. AgF (Silver Fluoride)
2. AgCl (Silver Chloride)
3. AgBr (Silver Bromide)
4. PbCl2 (Lead(II) Chloride)

### Step 2: Understand Solubility in Water
Solubility in water is largely determined by the ionic or covalent nature of the compounds. Ionic compounds tend to be soluble in water, while covalent compounds are generally insoluble.

### Step 3: Analyze Each Halide
- **AgF (Silver Fluoride)**: This compound is ionic due to the high electronegativity and small size of fluorine. Therefore, AgF is soluble in water.

- **AgCl (Silver Chloride)**: This compound is more covalent in nature due to the larger size and lower electronegativity of chlorine compared to fluorine. Hence, AgCl is insoluble in water.

- **AgBr (Silver Bromide)**: Similar to AgCl, AgBr is also more covalent and thus is insoluble in water.

- **PbCl2 (Lead(II) Chloride)**: PbCl2 also exhibits covalent character and is generally considered insoluble in water.

### Step 4: Conclusion
Based on the analysis:
- **Insoluble Halides**: AgCl, AgBr, and PbCl2
- **Soluble Halide**: AgF

Thus, the halides that are not soluble in water are **AgCl, AgBr, and PbCl2**.

### Final Answer
The halides that are not soluble in water are:
- **AgCl**
- **AgBr**
- **PbCl2**