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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

II and III

B

only III

C

I and III

D

I and II

Text Solution

Verified by Experts

The correct Answer is:
B
Amorphous solids are not crystaline and do not have definete melting point. `SiO_(4)^(2-)` tetraline are randonly joined in the form of polymeter chain or three dimensional sheets.
`[O-overset(O)overset(|)underset(O)underset(|)Si-O-overset(O)overset(|)underset(O)underset(|)Si-O-overset(O)overset(|)underset(O)underset(|)Si-O]^(8-)`
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A2Z-SOLID STATE-Section D - Chapter End Test
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  2. The mass of unit cell of CaF(2) (fluorite structure) corresponds to

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  3. Close packing is maximum in the crystal which in the crystal which is

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  4. An ionic compound AB has ZnS type of structure if the radius A^(+) is ...

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  5. A pure crystallic substance , on being heated gradually first a hurbit...

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  6. Under which category iodine crystals are placed among the following

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  7. How many molecules are there in the unit cell of sodium chioride?

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  8. The structure of TICI is silmilar to CsCI .What would be the radius r...

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  9. Na and Mg crystallize in bcc- and fcc-type crystals, respectively, the...

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  10. In the closest packed struture of a metallic lattice , the number of m...

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  11. The number of atoms in 100 g an fcc crystal with density d = 10 g//cm^...

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  12. Potassium has a bcc structure with nearest neighour distance 4.52 Åits...

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  13. Ferrous oxide has cubes structure and each edge of the unit cell is 5....

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  14. In A^(+)B^(-) ionic compound radii of A^(=) and B^(-) ions are 180 "pm...

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  15. In the calcium fluoride structure, the coodination number of the catio...

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  16. Which of the following has Frenkel defect?

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  17. Which one of the following is the most correct statement?

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  18. The molecule having three fold axis of symmetry is :

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  19. In a f.c.c. arrangement of A and B atoms, where A atoms are at the cor...

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  20. In floorite structure (CaF(2))

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  21. A solid is made of two element X and Y .The atoms Z are in C CP arrang...

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