Advertisements
Advertisements
प्रश्न
Which of the following is an amorphous solid?
पर्याय
Graphite (C)
Quartz glass (SiO2)
Chrome alum
Silicon carbide (SiC)
Advertisements
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)
APPEARS IN
संबंधित प्रश्न
What is the hybridisation of carbon atom in diamond and graphite?
Why do solids have a definite volume?
Why is glass considered a super cooled liquid?
‘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?
Write any two differences between amorphous solids and crystalline solids
Why does sodium chloride on heating with sodium vapours acquire yellow colour?
Which among the following is not an example of amorphous solids?
Amorphous solids are also known as ____________.
Most crystals show good cleavage because their atoms, ions or molecules are ____________.
“Crystalline solids are anisotropic in nature″. What is the meaning of anisotropic in the given statement?
Which of the following is not a crystalline solid?
Which of the following statements about amorphous solids is incorrect?
Which of the following statement is not true about amorphous solids?
Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?
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.
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.)
