Question

Select the correct statement(s)

i) The C.N. of cation occupying a tetrahedral hole is 4

ii) The C.N. of cation occupying a octahedral hole is 6
iii) In Schotky defects, density of the lattice decreases.

IV)In Frenkel defects, density of the lattice increases.

• A. i, ii & iv
• B. ii & iii
• C. i, ii & iii
• D. i& iii

Answer 1

The correct option is C

i, ii & iii

Since tetrahedral holes are surrounded by 4 nearest neighbours. So, the C.N. of cation occupying
tetrahedral hole is 4. Since octahedral hole is surrounded by six nearest neighbours, so, C.N. of
cation occupying octahedral is 6.

In schottky a pair of anion and cation leaves the lattice, so density of lattice decreases.