question_answer 52)

  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:

                  (b) Crystalline solid is anisotropic in nature as this solid shows different physical properties such as electrical resistance, refractive index in different directions. Note Isotropic and anisotropic properties are related to amorphous solid and crystalline solid which can be clearly understood as  

Property	Types of solid	Physical properties
Isotropy Anisotropy	Amorphous solid Crystalline solid	Same value Different values