The intermolecular distance is less within the molecules of a solid and repulsive force occurs between the electron clouds which makes the solids incompressible.
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substances?
Correct Answer: Option (d) Explanation: These are the factors in which the electron spins are associated with magnetic atoms in certain crystallographic areas and are directed at each other in such...
Which of the following is an amorphous solid?
(i) Graphite (C) (ii) Quartz glass (SiO2) (iii) Chrome alum (iv) Silicon carbide (SiC) Correct Answer: (ii) Quartz glass (SiO2) Explanation: Solids are considered as an amorphous when they...
Which of the following is not a characteristic of a crystalline solid?
(i) Definite and characteristic heat of fusion (ii) Isotropic nature (iii) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal (iv) A true solid...
Which of the following conditions favours the existence of a substance in the solid state?
(i) High temperature (ii) Low temperature (iii) High thermal energy (iv) Weak cohesive forces Correct Answer: (ii) Low temperature Explanation: At the low temperatures, the substances...
Q4. (i) What is meant by the term ‘coordination number’?
(ii) What is the coordination number of atoms:
(a) in a cubic close-packed structure?
(b) in a body-centred cubic structure?
(i) Coordination number is the number of nearest neighbours around a particle.(ii) (a) coordination number of close-packed structure is 12 (b) coordination number of body centred cubic...
Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.
(a) Tetra phosphorus decaoxide (P4O10)
(b) Ammonium phosphate (NH4)3PO4
(c) SiC
(d) I2
(e) P4
(f) Plastic
(g) Graphite
(h) Brass
(i) Rb
(j) LiBr
(k) Si
Metallic : ( h ) Brass, ( i ) Rb Molecular : (a) Tetra phosphorus decaoxide (P4O10), (d) I2, (e) P4. Ionic : ( b ) Ammonium phosphate (NH4)3PO4, ( j ) LiBr Amorphous : ( f )...
What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass?
The arrangement of the constituent particles makes a glass different from a solid such as quartz. The constituent particles in glass are of a short-range order, but the constituent particles of...
Define the term ‘amorphous’. Give a few examples of amorphous solids.
Amorphous solids are solids having no regular arrangements of their constituent particles like ions, atoms or molecules. They possess short-range order i.e., a regular and periodically repeating...