Asked in PMC Practice Test 23 (2021) 2021Moderate

Ancient glass becomes milky due to

Correct answer: B. Crystallization

  • A. Refraction
  • B. Crystallization
  • C. Volatilization
  • D. Dispersion

Explanation

Ancient glass, an amorphous solid, undergoes alternate heating due to exposure to the sun during the day and cooling at night and is converted into partly crystalline form which results in the milky appearance. Refraction is the bending of light as it moves from a transparent substance into another. Volatilization is when a solid or liquid chemical substance is converted into vapours.

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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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