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Q23 (CDS-II/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry Answer Verified

Which one among the following statements is not true for glass?

Result
Your answer: —  Â·  Correct: C
Explanation

Statement 3 is incorrect because glass is an amorphous solid, not a crystalline one. Glass formation occurs when a liquid is cooled rapidly enough to prevent crystalline nucleation and ordering [1]. This rapid cooling circumvents the crystallization process, resulting in a disordered, metastable state known as a supercooled liquid. If slow cooling were to occur, the material might develop crystallinity, but the resulting substance would no longer be classified as glass. Regarding the other options: sodium silicate is indeed commonly known as water glass due to its water solubility [2]. Glass is scientifically described as a supercooled liquid because it retains a liquid-like disordered structure while possessing the mechanical rigidity of a solid [1]. Finally, colored glasses are produced by adding various metal oxides or coloring materials during the melting process [3].

Sources

  1. [1] https://pmc.ncbi.nlm.nih.gov/articles/PMC11725876/
  2. [2] https://www.osti.gov/servlets/purl/1767764
  3. [3] https://en.wikipedia.org/wiki/Glass
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