QJEEM21Ch9a72: JEE Main 2021 Chemistry - Class 12 JEEM21Ch9a72 Solution: The number of octahedral voids per lattice site in a lattice is …

Let us assume, the crystal has fcc or ccp lattice which has octahedral voids.

Number of lattice sites occupied = 8 corner + 6 face centres = 14

Number of octahedral voids = 12 edge centres + 1 body centre = 13

Number of octahedral void(s) per lattice site

$= {{13} \over {14}} = 0.928 \simeq 1$