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प्रश्न
Which of the following is an amorphous solid?
विकल्प
Graphite (C)
Quartz glass (SiO2)
Chrome alum
Silicon carbide (SiC)
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उत्तर
Quartz glass (SiO2)
Explanation:
| Crystalline Silica (Quartz) | Amorphous Silica (Glass) | |
| 1. | Crystalline in nature. Also called quartz. | Light white powder. |
| 2. | All four corners of \[\ce{SiO4}\] tetrahedron are shared by others to give a network solid. | The \[\ce{sio4}\] tetrahedron are randomly joined giving rise to polymeric chains, sheets or three- dimensional units |
| 3. | High and sharp melting point (1710°C) | Does not have sharp melting point. On heating softens gradually to liquid. |
(a) Crystalline (Quartz)
(b) Amorphous (Quartz glass)
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संबंधित प्रश्न
The relation a ≠ b ≠ c and α ≠ β ≠ γ represents which crystal system?
(A) Orthorhombic
(B) Tetragonal
(C) Triclinic
(D) Monoclinic
Why do solids have a definite volume?
Why is glass considered a super cooled liquid?
Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?
‘Stability of a crystal is reflected in the magnitude of its melting points.’ Comment. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?
Amorphous solids are also known as ____________.
Assertion: Stability of a crystal is reflected in the magnitude of its melting.
Reason: The stability of a crystal depends upon the strength of the interparticle attractive force.
Which of the following is not a crystalline solid?
The sharp melting point of crystalline solids is due to ______.
Which one of the following is non-crystalline or amorphous?
Which of the following is true about the value of refractive index of quartz glass?
Amorphous solid can also be called:
(i) pseudo solids
(ii) true solids
(iii) supercooled liquids
(iv) supercooled solids
Which of the following features are not shown by quartz glass?
(i) This is a crystalline solid.
(ii) Refractive index is same in all the directions.
(iii) This has definite heat of fusion.
(iv) This is also called super cooled liquid.
Under which situations can an amorphous substance change to crystalline form?
The property of crystalline solid is not ______.
An ionic solid AB2 isomorphous to the rutile structure (a tetragonal system with the effective number of formula units = 2) has edge lengths of the unit cell of 4Å, 4Å and 7Å. The density of the substance is ______ mg/cc. (if its formula weight is 80. The NA = 6 × 1023 and express your answer in mg/cc using four significant digits.)
