`Hg_(2(NO_(3))_(2)+NH_(3)("solution")to Hgdarr+HgO*NH_(2)NO_(3)darr`

Options

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

Answer

To solve the given reaction \( \text{Hg}_2(\text{NO}_3)_2 + \text{NH}_3(\text{solution}) \rightarrow \text{Hg} \downarrow + \text{HgO} \cdot \text{NH}_2\text{NO}_3 \downarrow \), we need to analyze the type of reaction that is taking place. Here’s a step-by-step breakdown:

### Step 1: Identify the Reactants and Products
- **Reactants**: \( \text{Hg}_2(\text{NO}_3)_2 \) (mercury(II) nitrate) and \( \text{NH}_3 \) (ammonia solution).
- **Products**: \( \text{Hg} \) (mercury, solid precipitate) and \( \text{HgO} \cdot \text{NH}_2\text{NO}_3 \) (a complex, also a precipitate).

### Step 2: Determine the Formation of Precipitates
- In the reaction, we observe that both products \( \text{Hg} \) and \( \text{HgO} \cdot \text{NH}_2\text{NO}_3 \) are indicated by downward arrows, which signify that they are precipitates formed from the reaction.

### Step 3: Classify the Reaction
- Since there are no precipitates present on the reactant side and two precipitates formed on the product side, this indicates a **precipitate formation reaction**.
- In a precipitate formation reaction, the reactants do not contain any solids that precipitate out, but the products do.

### Step 4: Eliminate Other Options
- **Precipitate Dissolution Reaction**: This would require a solid precipitate in the reactants that dissolves, which is not the case here.
- **Precipitate Exchange Reaction**: This would involve two different precipitates on both sides, which is not applicable as we have a formation of new precipitates rather than an exchange.
- **No Reaction**: This is clearly incorrect since a reaction is taking place with the formation of products.

### Conclusion
The correct classification of the reaction is a **precipitate formation reaction** as it involves the formation of precipitates from reactants that initially did not contain any solid precipitate.

### Final Answer
The reaction is classified as a **precipitate formation reaction**.

---