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Q.

Silica (SiO2) can be crystalline as well as amorphous with following properties:I. It has high and sharp melting point.II. CrystallineIII. The SiO42- 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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a

II and III

b

Only III

c

I and III

d

I and II

answer is B.

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Detailed Solution

Amorphous solids are not crystalline and do not have definite melting points. SiO42- tetrahedral are randomly joined in the form of polymeric chain or three-dimensional sheets.
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