Which of the following statements is incorrect about amorophous solids?

Options

A. They are anisotropic
B. They are rigid and incompressible
C. They melt over a wide range of temperature
D. There is no orderly arragement of particles

Answer

To determine which statement is incorrect about amorphous solids, let's analyze each option step by step.

### Step 1: Analyze Option A
**Statement:** Amorphous solids are anisotropic.

**Explanation:** Anisotropic materials have different physical properties in different directions. Crystalline solids are anisotropic due to their long-range order and fixed arrangement of particles. In contrast, amorphous solids lack this long-range order and have a random arrangement of particles, making them isotropic. Thus, this statement is incorrect.

### Step 2: Analyze Option B
**Statement:** Amorphous solids are rigid and incompressible.

**Explanation:** Amorphous solids are indeed rigid due to the close packing of their particles, which results in minimal gaps between them. This rigidity contributes to their incompressibility. Therefore, this statement is correct.

### Step 3: Analyze Option C
**Statement:** Amorphous solids melt over a wide range of temperature.

**Explanation:** Amorphous solids do not have a sharp melting point like crystalline solids. Instead, they gradually soften over a range of temperatures. This characteristic is true for amorphous solids, making this statement correct.

### Step 4: Analyze Option D
**Statement:** There is no orderly arrangement of particles in amorphous solids.

**Explanation:** Amorphous solids are characterized by a lack of long-range order in their particle arrangement. They do exhibit some short-range order, but overall, the arrangement is not systematic or orderly. Hence, this statement is also correct.

### Conclusion
After analyzing all the options, the incorrect statement about amorphous solids is:
**Answer:** Option A - Amorphous solids are anisotropic.

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