`PbO_(2) ↓+HNO_(3)("Conc.") to Pb(NO_(3))_(2)+H_(2)O+[O]`

Options

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

Answer

To determine the type of reaction for the given equation \( \text{PbO}_2 + \text{HNO}_3(\text{Conc.}) \rightarrow \text{Pb(NO}_3)_2 + \text{H}_2\text{O} + [\text{O}] \), we can follow these steps:

### Step 1: Identify the Reactants and Products
The reactants are lead(IV) oxide (\( \text{PbO}_2 \)) and concentrated nitric acid (\( \text{HNO}_3 \)). The products are lead(II) nitrate (\( \text{Pb(NO}_3)_2 \)), water (\( \text{H}_2\text{O} \)), and nascent oxygen (\( [\text{O}] \)).

### Step 2: Analyze the State of Reactants and Products
- **Reactants**: \( \text{PbO}_2 \) is a solid precipitate (indicated by the downward arrow).
- **Products**: \( \text{Pb(NO}_3)_2 \) is soluble in water, \( \text{H}_2\text{O} \) is also soluble, and nascent oxygen is a gaseous product.

### Step 3: Determine the Reaction Type
In this reaction:
- The solid lead(IV) oxide (\( \text{PbO}_2 \)) is reacting with concentrated nitric acid.
- The solid precipitate (\( \text{PbO}_2 \)) is being converted into soluble lead(II) nitrate (\( \text{Pb(NO}_3)_2 \)).
- This indicates that the solid precipitate is dissolving into a soluble form.

### Conclusion
Since a solid precipitate (\( \text{PbO}_2 \)) is dissolving to form soluble products, this reaction is classified as a **precipitate dissolution reaction**.

### Final Answer
The type of reaction is **B: Precipitate Dissolution Reaction**.

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