NEET 2023 — Chemistry solution

NEET2023Chemistry

What fraction of one edge centred octahedral void lies in one unit cell of fcc?

A
$\frac{1}{3}$
B
$\frac{1}{4}$
C
$\frac{1}{12}$
D
$\frac{1}{2}$

Solution

An edge of a cubic unit cell is shared between four adjacent unit cells, so any feature located on that edge (such as an edge-centred octahedral void) contributes $\frac{1}{4}$ to each cell.

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