A solid containing irregular arrangement of molecules produces irregular fragments uponbreaking. This solid is calledI. amorphousII. crystallineIII. polymeric
Correct answer: A. I only.
- A. I only.
- B. II only.
- C. I and III.
- D. II and III.
Explanation
The correct answer is I only. Amorphous solids are characterized by an irregular arrangement of molecules, which causes them to break into irregular fragments. In contrast, crystalline solids have a regular, repeating pattern of molecules, leading to well-defined fragments upon breaking. Polymers can have both regular and irregular structures, but the question specifically refers to the irregular arrangement leading to irregular fragments, which is characteristic of amorphous solids.
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About Crystalline and Amorphous Solids
Crystalline solids have a regular, repeating lattice and a sharp melting point, while amorphous solids lack long-range order and soften over a temperature range. The topic covers unit cells, anisotropy, cleavage, symmetry and examples such as salts, metals, glass and plastics. Crystalline order must not be confused with mere hardness.
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