Which metal burn in air at high temperature with the evolution of much heat

Options

A. Cu
B. Hg
C. Pb
D. Al

Answer

To determine which metal burns in air at high temperature with the evolution of much heat, we can analyze the properties of various metals and their reactions with oxygen.

### Step-by-Step Solution:

1. **Understanding Metal Combustion**:
- Metals can react with oxygen in the air to form metal oxides. This reaction is often exothermic, meaning it releases heat.

2. **Identifying Metals**:
- Common metals that can burn in air include magnesium, aluminum, zinc, and iron. Each of these metals has different properties and reactivity with oxygen.

3. **High-Temperature Requirement**:
- Some metals require high temperatures to ignite and burn. For example, aluminum and magnesium can burn at high temperatures.

4. **Analyzing Aluminum**:
- Aluminum is known to burn in air at high temperatures. When aluminum reacts with oxygen, it forms aluminum oxide (Al2O3) and releases a significant amount of heat.

5. **Comparing Other Metals**:
- Magnesium also burns in air, but it burns even more vigorously than aluminum. However, the question specifically asks for a metal that burns at high temperatures and evolves much heat, which applies to both aluminum and magnesium.

6. **Conclusion**:
- Among the metals discussed, aluminum is a prime candidate as it burns in air at high temperatures and releases a considerable amount of heat. Thus, the answer to the question is aluminum.

### Final Answer:
**Aluminum burns in air at high temperature with the evolution of much heat.**