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Silica (SiO(2)) can be crystalline as we...

Silica `(SiO_(2))` can be crystalline as well as amorphes with following properties
(I) it has hight and sharp melting point
(II) Crystalline
(III) The `SiO_(4)^(2)` letrahedral are randomly joined to give polymeric chains or three - demensional sheets
Which of the properties is/are matced with amophous solids?

A

I

B

III

C

I,III

D

II

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