Sparingly soluble salt is

Options

A. KCl
B. NaCl
C. `NH_(4)Cl`
D. `BaSO_(4)`

Explanation

To determine which of the given salts is sparingly soluble, we can analyze the solubility of each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Salts**: The salts mentioned are potassium chloride (KCl), sodium chloride (NaCl), ammonium chloride (NH4Cl), and barium sulfate (BaSO4).

2. **Understand Solubility**: A sparingly soluble salt is one that does not dissolve well in water. This means that its solubility product (Ksp) is low, leading to only a small amount of the salt dissolving.

3. **Analyze Each Salt**:
- **Potassium Chloride (KCl)**: This salt is highly soluble in water.
- **Sodium Chloride (NaCl)**: This salt is also highly soluble in water.
- **Ammonium Chloride (NH4Cl)**: This salt is soluble in water.
- **Barium Sulfate (BaSO4)**: This salt is known to be sparingly soluble in water.

4. **Conclusion**: Among the salts listed, barium sulfate (BaSO4) is the only sparingly soluble salt. The reason for its low solubility is due to the decreasing hydration energy of the alkaline earth metal sulfates as we move down the group, which is less than the lattice energy of BaSO4, making it difficult for the salt to dissolve.

5. **Final Answer**: The sparingly soluble salt from the options given is **Barium Sulfate (BaSO4)**.