Select the true statement about the amorphous solids:
Correct answer: B. Amorphous substances do not have a fixed melting point
- A. Amorphous substances have a sharp melting point
- B. Amorphous substances do not have a fixed melting point
- C. Amorphous substances have proper geometrical shapes
- D. The particles in amorphous substances are arranged in an orderly manner
Explanation
Amorphous solids, unlike crystalline solids, do not have a fixed melting point. This is because they lack the ordered structure that characterizes crystalline materials. Instead, they soften gradually over a range of temperatures. For example, glass softens before melting completely. Amorphous solids have a disordered atomic or molecular structure, which results in their unique properties such as isotropic behavior and lack of sharp melting points. Option B correctly identifies this characteristic, whereas the other options incorrectly attribute properties of crystalline solids to amorphous ones.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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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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