Q. 23.7( 10 Votes )

Which of the following is not a characteristic of a crystalline solid?
A. Definite and characteristic heat of fusion.

B. Isotropic nature.

C. A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.

D. A true solid

Answer :

Isotropicity (equal values of physical properties) or anisotropicity (unequal values of symmetrical properties) is the property that deals with distribution of inherent physical property( eg. - mechanical strength, refractive index) of any substance to the different molecular axes in accordance with the symmetry of the molecules of that substance.


Crystalline solids are anisotropic in nature i.e. they show different values of physical properties like electrical resistance or refractive index in different directions, unlike the amorphous solids. This is primarily because of their uneven arrangement of particles in different directions (x, y and z axes). It depends upon the symmetry of the molecules which are arranged in a different way in all the planes (3-dimensional x, y and z planes ).


aniso.jpg


This figure above shows an example of a simple 2-dimensional arrangement of 2 different types of atoms in a crystal. Here the CD direction row there is 2 types of atoms whereas in AB direction row is made of only one type of atoms – this arrangement will result in anisotropicity and different values for physical properties in different rows of directions.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Defects in solid | Solid StateDefects in solid | Solid StateDefects in solid | Solid State61 mins
Defects in solid | Solid State | Quiz TimeDefects in solid | Solid State | Quiz TimeDefects in solid | Solid State | Quiz Time49 mins
Electrical & Magnetic PropertiesElectrical & Magnetic PropertiesElectrical & Magnetic Properties47 mins
Packing efficiency and densityPacking efficiency and densityPacking efficiency and density52 mins
Packing efficiency and density | Interactive QuizPacking efficiency and density | Interactive QuizPacking efficiency and density | Interactive Quiz45 mins
Interactive Quiz on close packing in solidsInteractive Quiz on close packing in solidsInteractive Quiz on close packing in solids45 mins
Classification of solidsClassification of solidsClassification of solids65 mins
Close packing in solidsClose packing in solidsClose packing in solids46 mins
Quiz on Calculation of coordination number in solidsQuiz on Calculation of coordination number in solidsQuiz on Calculation of coordination number in solids38 mins
Interactive Quiz on classification of solids & packingInteractive Quiz on classification of solids & packingInteractive Quiz on classification of solids & packing53 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses