Select the wrong statement(s):

Options

A. `CaF_(2)` is soluble in water
B. `BaSO_(4)` is soluble in water
C. `Be(OH)_(2)` is soluble in water
D. `MgSO_(4)` is soluble in water

Answer

To solve the question of identifying the wrong statements regarding the solubility of certain compounds in water, we will analyze each statement one by one based on the principles of solubility, particularly focusing on lattice energy and hydration energy.

### Step-by-Step Solution:

1. **Statement 1: Calcium fluoride is soluble in water.**
- **Analysis**: Calcium fluoride (CaF2) is known to be insoluble in water. The high lattice energy of CaF2, which arises from the strong ionic bonds between calcium ions (Ca²⁺) and fluoride ions (F⁻), is greater than the hydration energy when it dissolves in water. Thus, this statement is **incorrect**.

2. **Statement 2: Barium sulfate is soluble in water.**
- **Analysis**: Barium sulfate (BaSO4) is also insoluble in water. The large size of the Ba²⁺ and SO4²⁻ ions leads to a high lattice energy that exceeds the hydration energy, making it difficult for the compound to dissolve in water. Therefore, this statement is **incorrect**.

3. **Statement 3: Beryllium hydroxide is soluble in water.**
- **Analysis**: Beryllium hydroxide (Be(OH)2) is insoluble in water. The small size of the beryllium ion (Be²⁺) contributes to a high lattice energy, which is not compensated by hydration energy, resulting in low solubility. Thus, this statement is **incorrect**.

4. **Statement 4: Magnesium sulfate is soluble in water.**
- **Analysis**: Magnesium sulfate (MgSO4) is soluble in water. The hydration energy of MgSO4 is higher than its lattice energy, allowing it to dissolve readily in water. Therefore, this statement is **correct**.

### Conclusion:
The wrong statements are:
- Statement 1: Calcium fluoride is soluble in water (**Incorrect**)
- Statement 2: Barium sulfate is soluble in water (**Incorrect**)
- Statement 3: Beryllium hydroxide is soluble in water (**Incorrect**)

The correct statement is:
- Statement 4: Magnesium sulfate is soluble in water (**Correct**)

### Final Answer:
The wrong statements are 1, 2, and 3.

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