Which of the given metals is stored under kerosene to prevent oxidation?

Options

A. Copper
B. Potassium
C. Magnesium
D. Calcium

Explanation

To determine which metal is stored under kerosene to prevent oxidation, we can follow these steps:

### Step 1: Understand the Reactivity of Metals
- Metals vary in their reactivity with oxygen. Some metals react vigorously with air and can catch fire if exposed.

### Step 2: Identify the Metals in Question
- The metals mentioned in the video are sodium, potassium, copper, magnesium, and calcium.

### Step 3: Analyze Each Metal's Reactivity
- **Copper**: It is not very reactive and does not readily react with air, so it does not need to be stored under kerosene.
- **Potassium**: This metal is highly reactive with oxygen and can ignite spontaneously in air. Therefore, it is stored under kerosene to prevent oxidation.
- **Magnesium**: It does react with oxygen but not as vigorously as sodium or potassium. It can be stored in open air for short periods.
- **Calcium**: Similar to magnesium, it does not react as aggressively as potassium or sodium with air.

### Step 4: Conclusion
- Based on the analysis, the metal that is stored under kerosene to prevent oxidation is **Potassium**.

### Final Answer
- The correct answer is **Potassium**.

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