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प्रश्न
Write any two differences between amorphous solids and crystalline solids
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उत्तर
| Crystalline solids | Amorphous solids |
| They have long range order i.e there is regular arrangement of molecules over a long distance. | They have short range order i.e there is regular arrangement of molecules over a short distance only. |
| They are anisotropic i.e the value of physical properties will be different when measured along different directions | They are isotropic i.e they will show same values of all physical properties when measured along different directions |
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संबंधित प्रश्न
Classify the following as amorphous or crystalline solids:
Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
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?
Define the term ‘amorphous’.
Which among the following is not an example of amorphous solids?
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.
Most crystals show good cleavage because their atoms, ions or molecules are ____________.
A crystalline solid ____________.
Which of the following statement is not true about amorphous solids?
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.
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.)
