Silica $({SiO}_{2})$ can be crystalline as well as amorphous with following properties:
I. It has high and sharp melting point.
II. Crystalline
III. The ${SiO}_{4}^{2 -}$ tetrahedral are randomly joined to give polymeric chains or three-dimensional sheets.
Which of the properties is/are matched with amorphous solids?

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II and III

Only III

I and III

I and II

answer is B.

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Detailed Solution

Amorphous solids are not crystalline and do not have definite melting points. $S i O_{4}^{2 -}$ tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets.

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