Which of the following does not corrode when exposed to the atmosphere?

Options

A. Iron
B. Copper
C. Gold
D. Silver

Explanation

To determine which of the given options does not corrode when exposed to the atmosphere, we can follow these steps:

### Step 1: Understand Corrosion
Corrosion is the process where metals react with moisture and oxygen in the atmosphere, leading to deterioration. The rate of corrosion varies among different metals.

### Step 2: Identify the Metals
Assuming the options provided include metals like iron, copper, silver, and gold, we need to analyze their reactivity.

### Step 3: Refer to the Reactivity Series
The reactivity series ranks metals from most reactive to least reactive. The most reactive metals corrode more easily, while the least reactive metals are more resistant to corrosion.

### Step 4: Analyze Each Metal
- **Iron**: Reacts with moisture and oxygen, leading to rusting.
- **Copper**: Can corrode but is relatively resistant compared to iron.
- **Silver**: Does tarnish but is more resistant than iron.
- **Gold**: Is the least reactive and does not corrode when exposed to the atmosphere.

### Step 5: Conclusion
Based on the reactivity series, gold is the least reactive metal among the options provided. Therefore, it does not corrode when exposed to the atmosphere.

### Final Answer
The metal that does not corrode when exposed to the atmosphere is **Gold**.

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