There is foul small in presence of moisture with

Options

A. `AICI_(3)`
B. `AI_(2)(SO_(4))_(3)`
C. `FeS`
D. `FeSO_(4)`

Answer

To solve the question regarding which compound produces a foul smell in the presence of moisture, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four options: AlCl3 (Aluminum Chloride), Al2(SO4)3 (Aluminum Sulfate), FeS (Iron Sulfide), and FeSO4 (Iron(II) Sulfate).

2. **Understand the Context**: The question specifically mentions a "foul smell" in the presence of moisture. This indicates that we are looking for a compound that, when it comes into contact with water, produces a gas or substance that has a strong, unpleasant odor.

3. **Analyze Each Compound**:
- **AlCl3**: This compound does not produce any foul-smelling gas when mixed with moisture.
- **Al2(SO4)3**: This compound also does not produce a foul smell in the presence of moisture.
- **FeS**: Iron Sulfide is known to react with moisture to produce hydrogen sulfide (H2S), which has a characteristic foul smell often described as that of rotten eggs.
- **FeSO4**: While this compound can react with moisture, it does not produce a foul smell.

4. **Conclusion**: Based on the analysis, the compound that produces a foul smell in the presence of moisture is **FeS (Iron Sulfide)**, as it generates hydrogen sulfide gas.

5. **Final Answer**: The correct option is **C: FeS (Iron Sulfide)**.