Which of the following is an amorphous solid? (1) Teflon (2) Cellophane (3) Poly vinyl chloride (4) Fibre glass (5) All of these

Options

A. Graphite (C )
B. Quartz glass (`SiO_(2)`)
C. Chrome alum
D. Silicon carbide (SiC)

Explanation

To determine which of the given options is an amorphous solid, we need to analyze each option based on the characteristics of amorphous solids.

### Step-by-Step Solution:

1. **Understanding Amorphous Solids**:
- Amorphous solids are materials that do not have a long-range order in their atomic arrangement. They lack a definite geometric shape and do not have a sharp melting point. Instead, they soften over a range of temperatures.

2. **Analyzing Each Option**:
- **(1) Teflon**: Teflon is a polymer known for its non-stick properties. It is an amorphous solid because it has a disordered arrangement of polymer chains.
- **(2) Cellophane**: Cellophane is a transparent film made from regenerated cellulose. It is also considered an amorphous solid due to its irregular structure.
- **(3) Polyvinyl Chloride (PVC)**: PVC is a widely used plastic that can be found in both rigid and flexible forms. It is an amorphous polymer as well, characterized by its lack of long-range order.
- **(4) Fiberglass**: Fiberglass is made from fine glass fibers and is used for insulation and reinforcement. It is an amorphous solid due to the random arrangement of its glass fibers.
- **(5) All of These**: Since all the previous options are identified as amorphous solids, this option suggests that all listed materials fall under this category.

3. **Conclusion**:
- Since Teflon, Cellophane, Polyvinyl Chloride, and Fiberglass are all amorphous solids, the correct answer is **(5) All of These**.

### Final Answer:
**(5) All of These**

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