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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?
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Which of the following statement is not true about amorphous solids?
Which one of the following is non-crystalline or amorphous?
Amorphous solids are ______.
Which of the following is true about the value of refractive index of quartz glass?
Which of the following features are not shown by quartz glass?
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(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?
Assertion A: Sharp glass edge becomes smooth on heating it upto its melting point.
Reason R: The viscosity of glass decreases on melting.
Choose the most appropriate answer from the options given below.
