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Q.

Which of the following is not a correct statement?

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a

Any material can be made amorphous by quenching it’s melt (or) freezing it’s vapour

b

The melt of an amorphous solid when slowly cooled it will become crystalline

c

Glass melts over a range of temperatures

d

Quartz has irregular chains of SiO4 units.

answer is D.

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Detailed Solution

  • Quartz is a crystalline solid.
  • A crystalline solid usually consists of a large number of small crystals, each of them having a definite characteristic geometrical shape. 
  • In a crystal, the arrangement of constituent particles (atoms, molecules or ions) is ordered. 
  • It has long range order which means that there is a regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
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