Question

This section contains questions each with two columns-I and II. Match the items given in column I with that in column II (unoccupied volume).

Answer 1

hcp and ccp unit cells represent the closest packed structure.

The volume occupied (as a fraction of total volume) is 0.78
The volume unoccupied (as a fraction of total volume) is $1-0.78=0.22$.

For bcc unit cell, the volume occupied (as a fraction of total volume) is 0.62.
The volume unoccupied (as a fraction of total volume) is $1-0.62=0.38$.

For sc unit cell, the volume occupied (as a fraction of total volume) is 0.52.
The volume unoccupied (as a fraction of total volume) is $1-0.52=0.48$.

For dc unit cell, the volume occupied (as a fraction of total volume) is 0.34 .
The volume unoccupied (as a fraction of total volume) is $1-0.34=0.66$.