Which of the following compounds are soluble in water ?

Options

A. `CaC_(2)O_(4)`
B. `SrSO_(4)`
C. `BaCl_(2)`
D. `(NH_(4))_(2)C_(2)O_(4)`

Answer

To determine which of the given compounds are soluble in water, we will analyze each compound individually based on their solubility properties.

### Step-by-Step Solution:

1. **Calcium Oxalate (CaC2O4)**:
- When calcium oxalate is added to water, it does not dissolve.
- **Conclusion**: Calcium oxalate is **insoluble** in water.

2. **Strontium Sulphate (SrSO4)**:
- Strontium sulphate also does not dissolve in water.
- **Conclusion**: Strontium sulphate is **insoluble** in water.

3. **Barium Chloride (BaCl2)**:
- Barium chloride dissolves readily in water. When it is added to water, it dissociates into barium ions (Ba²⁺) and chloride ions (Cl⁻).
- **Conclusion**: Barium chloride is **soluble** in water.

4. **Ammonium Oxalate ((NH4)2C2O4)**:
- Ammonium oxalate is soluble in water as it dissociates into ammonium ions (NH4⁺) and oxalate ions (C2O4²⁻).
- **Conclusion**: Ammonium oxalate is **soluble** in water.

### Final Answer:
The compounds that are soluble in water are **Barium Chloride (BaCl2)** and **Ammonium Oxalate ((NH4)2C2O4)**.

---