Amorphous solids are

Options

A. isotropic and supercooled liquids
B. anisotropic and supercooled liquids
C. isoenthalpic and superheated liquids
D. isotropic and superheated solids

Answer

**Step-by-Step Text Solution:**

1. **Understanding Amorphous Solids**: Amorphous solids are a type of solid that does not have a long-range order in their molecular structure. Unlike crystalline solids, which have a well-defined geometric arrangement, amorphous solids lack this regular pattern.

2. **Physical Properties**: Amorphous solids exhibit the same physical properties in all directions. This characteristic is known as isotropy. For example, properties such as refractive index, electrical conductivity, and resistivity remain constant regardless of the direction in which they are measured.

3. **Isotropic Solids**: Since amorphous solids show isotropic behavior, they are classified as isotropic solids. This means that their physical properties do not vary with direction.

4. **Pseudosolids and Supercooled Liquids**: Amorphous solids are also referred to as pseudosolids because they have the ability to flow like liquids under certain conditions. This behavior leads to the term "supercooled liquids," indicating that while they are solid, they can exhibit liquid-like properties.

5. **Evaluating Options**:
- **Option A**: Isotropic and supercooled liquids - This is correct as amorphous solids are isotropic and can behave like supercooled liquids.
- **Option B**: Anisotropic and supercooled liquids - Incorrect because amorphous solids are isotropic, not anisotropic.
- **Option C**: Isoenthalpic and superheated liquids - Incorrect as isoenthalpy is not a relevant term for amorphous solids, and they are not superheated.
- **Option D**: Isotropic and superheated solids - Incorrect because while they are isotropic, they are not superheated; they are supercooled.

6. **Conclusion**: The correct answer is Option A: Amorphous solids are isotropic and supercooled liquids.

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