Which metal gives `NH_(4)NO_(3)`, when react with dilute `HNO_(3)` acid?

Options

A. `Zn`
B. `Pb`
C. `Cu`
D. `Au`

Explanation

To determine which metal gives `NH₄NO₃` when reacted with dilute `HNO₃`, we can analyze the reactions of the given metals with dilute nitric acid.

### Step-by-Step Solution:

1. **Identify the Metals**: The metals we are considering are Zinc (Zn), Lead (Pb), Copper (Cu), and Gold (Au).

2. **Reaction of Zinc with Dilute HNO₃**:
- When Zinc reacts with dilute nitric acid, the reaction can be represented as:
\[ 4 \text{Zn} + 10 \text{HNO}_3 \rightarrow 4 \text{Zn(NO}_3\text{)}_2 + \text{NH}_4\text{NO}_3 + 3 \text{H}_2\text{O} \]
- In this reaction, `NH₄NO₃` is produced as one of the products.

3. **Reaction of Lead with Dilute HNO₃**:
- Lead does not react with dilute nitric acid. Therefore, it cannot produce `NH₄NO₃`.

4. **Reaction of Copper with Dilute HNO₃**:
- When Copper reacts with dilute nitric acid, the reaction can be represented as:
\[ \text{Cu} + 4 \text{HNO}_3 \rightarrow \text{Cu(NO}_3\text{)}_2 + 2 \text{NO} + 2 \text{H}_2\text{O} \]
- Here, `NH₄NO₃` is not produced.

5. **Reaction of Gold with Dilute HNO₃**:
- Gold does not react with dilute nitric acid, similar to lead, and thus cannot produce `NH₄NO₃`.

6. **Conclusion**:
- From the analysis, only Zinc (Zn) produces `NH₄NO₃` when reacted with dilute `HNO₃`. Therefore, the answer is Zinc.

### Final Answer:
The metal that gives `NH₄NO₃` when reacted with dilute `HNO₃` is **Zinc (Zn)**.

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