The fibre that burns completely leaving no residue

Options

A. Cotton
B. Acrylic
C. Polyester
D. Polythene

Answer

**Step-by-Step Solution:**

1. **Understanding Types of Fibers**:
- There are two main types of fibers: natural fibers and synthetic fibers.
- Natural fibers are derived from plants and animals, while synthetic fibers are man-made.

2. **Combustion Process**:
- When fibers are burned in the presence of oxygen, they undergo combustion.
- The behavior of fibers during combustion can help identify their type.

3. **Residue After Burning**:
- Natural fibers typically do not leave any residue when burned.
- In contrast, synthetic fibers tend to leave a residue after burning.

4. **Examples of Fibers**:
- Examples of natural fibers include cotton, wool, and silk.
- Examples of synthetic fibers include polyester, nylon, and polythene.

5. **Identifying the Fiber**:
- Since the question asks for a fiber that burns completely leaving no residue, we focus on natural fibers.
- Among the natural fibers, cotton is a common example that burns completely without leaving any residue.

6. **Conclusion**:
- The fiber that burns completely leaving no residue is **cotton**.

---