The Solid State

• Question 33

In a crystal of zinc sulphide, zinc occupies tetrahedral voids. What is the coordination number of zinc?

Solution
The coordination number of zinc is 4.
Question 34

Why is potassium chloride sometimes violet instead of pure white?

Solution
This  is due to the electrons trapped in anionic vacancies or due to F-centres.
Question 35

When high temperature is given to ferromagnetic substance what effect can be obtain ?

Solution
As the temperature is raise the ferromagnetic substance starts to become paramagnetic due to randomisation spins.
Question 36

For hcp crystal structure of an element What is the maximum possible coordination number ?

Solution

The maximum coordination number is 12 in hcp crystal .