Which of the following is not a correct statement ?

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

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

Glass melts over a range of temperatures

Quartz has irregular chains of ${SiO}_{4}$ units.

answer is D.

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Detailed Solution

The first statement is true, any material can be made amorphous by heating it to a very high temperature and then quickly cooling it down that is quenching its melt or freezing its vapour. Similarly, the second and third statements are also true that the melt of an amorphous solid when slowly cooled becomes crystalline and glass melts over a range of temperatures. Only the fourth statement is false as Quartz has regular chains of ${SiO}_{4}$ units, making it the required answer.

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