# 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 .