`FeS darr+2HCl to FeCl_(2)+H_(2)S uarr`

Options

A. For precipitate formation reaction
B. For precipitate dissolution reaction
C. For precipitate exchange reaction
D. For no reaction

Answer

To analyze the reaction \( \text{FeS} + 2 \text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \) and determine the type of reaction, we can follow these steps:

### Step 1: Identify the Reactants and Products
- **Reactants**: Iron(II) sulfide (FeS) and hydrochloric acid (HCl).
- **Products**: Iron(II) chloride (FeCl2) and hydrogen sulfide (H2S).

### Step 2: Analyze the State of Reactants and Products
- The downward arrow (↓) next to FeS indicates that it is a precipitate.
- The upward arrow (↑) next to H2S indicates that it is a gas.

### Step 3: Determine the Nature of the Reaction
- Since FeS is a precipitate and is being converted into soluble FeCl2, it suggests that the precipitate is dissolving.
- Additionally, H2S, being a gas, escapes from the reaction mixture.

### Step 4: Classify the Reaction
- Given that a precipitate (FeS) is dissolving and a gas (H2S) is being produced, this reaction can be classified as a **precipitate dissolution reaction**.

### Conclusion
The final classification of the reaction \( \text{FeS} + 2 \text{HCl} \rightarrow \text{FeCl}_2 + \text{H}_2\text{S} \) is that it is a **precipitate dissolution reaction**.

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