Carbon occurs as the native element in the earth.s crust in the form of

Options

A. diamond
B. methane
C. carbon dioxide
D. gas carbon

Answer

**Step-by-Step Solution:**

1. **Understanding Native Element**: The question asks about carbon as a native element in the Earth's crust. A native element is one that occurs in its pure, uncombined form.

2. **Identifying Forms of Carbon**: Carbon exists in several forms, known as allotropes. The most common allotropes of carbon are diamond and graphite.

3. **Analyzing the Options**:
- **Option A: Diamond** - Diamond is a solid form of carbon and is found in the Earth's crust. It is indeed a native form of carbon.
- **Option B: Methane (CH₄)** - Methane is a compound of carbon and hydrogen, not a native form of carbon.
- **Option C: Carbon Dioxide (CO₂)** - Carbon dioxide is a gas and a compound of carbon, not a native form.
- **Option D: Gas Carbon** - This term is ambiguous, but generally refers to carbon in gaseous forms, which is not found in the solid state in the Earth's crust.

4. **Conclusion**: Since diamond is the only option that represents carbon in its native, solid form in the Earth's crust, the correct answer is **Option A: Diamond**.