Question

Statement: Crystalline solids are isotropic. State whether the given statement is true or false.
A. True
B. False

Answer 1

There are so many types of solids. Crystalline solid is one of them and it is also called ionic solids. When positive and negative ions are combining in a definite manner, then the ionic solid is formed. As Ionic solids contain ions that is why they have electrical conductivity nature by moving ions freely in a molten state but not in a solid state.

Complete step by step answer:
Crystalline solids are the ionic solid which has a definite structure. For example, NaCl. It is a solid crystal that has a cubic structure.
Crystalline solids are good conductors of heat and electricity. They have high electrical conductivity, high thermal conductivity, and high density.
Thermal conductivity is the ability of the material to transport heat from one point to another without movement of the whole material. Crystalline solids, like metal, have a large number of free electrons and due to their electronic conduction, heat can be conducted as well. The free electrons move freely throughout the solid and transfer the thermal energy because they possess metallic bonding.
This kind of physical properties of crystalline solids like dielectric constant, electrical conductance, refractive index, etc. gets changed with changing the direction. This nature of the crystalline solid is called anisotropic. On the other hand, any amorphous solids are isotropic in nature,

So, the given statement is false. The correct option is B.

Note:
In the case of amorphous solid the physical properties like dielectric constant, melting point, refractive index, etc. do not change with change in direction. This is called isotropy. Amorphous solids do not have any definite arrangement or structure. They have a powder texture. For example, silica is an amorphous solid.