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Q.

An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is

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a

2a

b

a

c

a2

d

a2

answer is A.

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Detailed Solution

In FCC ‘octahedral’ voids are at edge centre and body centre 

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both distances of nearest edge centers (or) edge center and body center are a2only

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