Which of the following salt is insoluble in water

Options

A. `CuSO_(4)`
B. `CdSO_(4)`
C. `PbSO_(4)`
D. `Bi_2(SO_(4))_(3)`

Explanation

To determine which of the following salts is insoluble in water, we need to analyze the solubility of each salt mentioned. Here’s a step-by-step solution:

### Step 1: Identify the salts
Let's list the salts mentioned in the question:
1. COSO4 (Cobalt(II) sulfate)
2. CDSO4 (Cadmium sulfate)
3. PbSO4 (Lead(II) sulfate)
4. Bi2SO4 (Bismuth(III) sulfate)

### Step 2: Analyze the solubility of each salt
- **COSO4 (Cobalt(II) sulfate)**: This salt is soluble in water.
- **CDSO4 (Cadmium sulfate)**: This salt is also highly soluble in water.
- **PbSO4 (Lead(II) sulfate)**: This salt is slightly soluble in water.
- **Bi2SO4 (Bismuth(III) sulfate)**: This salt is known to be insoluble in water but soluble in acids.

### Step 3: Conclusion
From the analysis, we can conclude that the salt that is insoluble in water is **Bi2SO4 (Bismuth(III) sulfate)**.

### Final Answer:
**Bi2SO4 (Bismuth(III) sulfate) is the salt that is insoluble in water.**

---