Advertisements
Advertisements
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
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
What is the hybridisation of carbon atom in diamond and graphite?
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?
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?
A crystalline solid ____________.
Which of the following is not a crystalline solid?
Which of the following is an amorphous solid?
Which of the following statement is not true about amorphous solids?
Why some glass objects from ancient civilisations are found to become milky in appearance?
Which of the following amorphous solid is used as photovoltaic material for conversion of sunlight into electricity?
Amorphous solids are ______.
Which of the following is true about the value of refractive index of quartz glass?
Amorphous solid can also be called:
(i) pseudo solids
(ii) true solids
(iii) supercooled liquids
(iv) supercooled solids
Under which situations can an amorphous substance change to crystalline form?
The property of crystalline solid is not ______.
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.)
