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Question
Classify the following as amorphous or crystalline solids:
Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.
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Solution
| Amorphous solids | Crystalline solids |
| Polyurethane | Naphthalene |
| Teflon | Benzoic acid |
| Cellophane | Potassium nitrate |
| Polyvinyl chloride | Copper |
| Fibre glass |
RELATED QUESTIONS
The relation a ≠ b ≠ c and α ≠ β ≠ γ represents which crystal system?
(A) Orthorhombic
(B) Tetragonal
(C) Triclinic
(D) Monoclinic
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Why is glass considered a super cooled liquid?
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Reason: The stability of a crystal depends upon the strength of the interparticle attractive force.
A crystalline solid ____________.
Which of the following is an amorphous solid?
The sharp melting point of crystalline solids is due to ______.
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Amorphous solid can also be called:
(i) pseudo solids
(ii) true solids
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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.
The property of crystalline solid is not ______.
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.
