Question

Points defects are present in
A.Ionic solids
B.Molecular solids
C.Amorphous solids
D.Liquids

Answer 1

Hint: Point defects are defined as those defects in which the atom is missing or is in an irregular place in the ionic solid lattice structure. Point defects include self-interstitial atoms, interstitial impurity atoms, substitutional atoms and vacancies.

Complete answer:
Now point defects start to occur in the crystalline solids. Point defects account for when the process of crystallization takes place at a faster rate. These types of deviations do exist in a compound only because of the fast rate of the crystallization process. These types of deviations exist mainly due to the deviation in the arrangement of the particles.
Now here it says that point defects can exist only in crystalline solids. Now crystalline solids are those solids which are formed by proper and ordered arrangement of particles of the atom or the compound.
Now in amorphous solids the arrangement of the particles is not present in any ordered fashion. Therefore, the point defect cannot actually exist in these types of solids.
Now in liquids the state of the matter is only different from solids as the point defect is a characteristic of solids.
Now among ionic solid and molecular solids, what happens in molecular solids is that the type of bond present between them is covalent as it is due to formation of the bonding so similar types of atoms and also the formation of crystallisation isn’t very fast so it can’t show point defect.
While in ionic solids, they are crystalline soils and the rate of formation of crystallization is also very fast, therefore ionic solids show point defects.
Answer- ionic solids show point defects.

Note:
The point defect is further divided on the type of abnormality in the structure of the solid. The three types of point defects that exist are stoichiometric or intrinsic defect, Frenkel defect and the Schottky defect.