Q. 26 B5.0( 1 Vote )

(i) Identify the

Answer :

(i) The type of defect show in the figure is Schottky defect. If in ionic crystal of the type A+B- equal number of cations and anions are missing from their lattice sites so that the electrical neutrality is maintained, it is called Schottky defect.


This type of defect shown by the highly ionic compounds which have:


high coordination number


small differences in the size of cations and anions.


Note: Coordination number of any constituent particle in a crystal is the number of its nearest neighbours.


(ii) For body centered cubic structure:


r =


(iii) Given :


Molar mass (M) = 63 g/mol


Edge length (a) = 360.8 pm = 360.8 × 10-8


Density (ρ) = 8.92 g/ cm3


First we will calculate the no. of atoms in per unit cell by applying the formula:


ρ =


where NA (Avogadro’s number) = 6.022 × 1023 mol-1


We can also write,


Z =


Z =


Z = 4


Thus, it is a face-centered cubic lattice.


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