Which of the followmg metals exist in their native state in nature? 

Options

A. I and ii
B. I and iii
C. ii and iv
D. iii and iv

Explanation

To determine which metals exist in their native state in nature, we need to analyze the reactivity of the given metals: copper (Cu), gold (Au), zinc (Zn), and silver (Ag).

### Step-by-Step Solution:

1. **Understanding Native State**:
- Metals that exist in their native state are typically those that are less reactive. This means they do not readily combine with other elements to form compounds.

2. **Analyzing Each Metal**:
- **Gold (Au)**: Gold is known for its low reactivity. It does not easily react with oxygen or other elements, allowing it to exist in its pure form in nature.
- **Silver (Ag)**: Like gold, silver is also less reactive. It can be found in its native state, although it may tarnish when exposed to sulfur compounds.
- **Copper (Cu)**: Copper is more reactive than gold and silver. It often forms compounds and is typically found in ores rather than in its native state.
- **Zinc (Zn)**: Zinc is quite reactive and does not exist in its native state. It readily reacts with acids and other elements.

3. **Conclusion**:
- Based on the reactivity of these metals, the ones that exist in their native state are **gold (Au)** and **silver (Ag)**. Therefore, the correct answer is option number 3, which includes Au (gold) and Ag (silver).

### Final Answer:
The metals that exist in their native state in nature are **gold (Au)** and **silver (Ag)**.

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