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प्रश्न
The sharp melting point of crystalline solids is due to ______.
विकल्प
a regular arrangement of constituent particles observed over a short distance in the crystal lattice
a regular arrangement of constituent particles observed over a long distance in the crystal lattice
same arrangement of constituent particles in different directions
different arrangement of constituent particles in different directions
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उत्तर
The sharp melting point of crystalline solids is due to a regular arrangement of constituent particles observed over a long distance in the crystal lattice.
Explanation:
A solid is said to be crystalline if the various constituent structural units (atoms, ions or molecules) of which the solid is made, are arranged in a definite geometrical pattern within the solid.
The type of forces in crystalline solids are of long range order due to which they have sharp melting point.
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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?
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’.
Why does sodium chloride on heating with sodium vapours acquire yellow colour?
Which among the following is not an example of amorphous solids?
“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 is an amorphous solid?
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 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.
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.)
