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Q.

The total number of tetrahedral voids in the face centred unit cell is ....

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a

8

b

12

c

10

d

6

answer is B.

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Detailed Solution

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In face centered cubic unit cell (FCC), tetrahedral voids are present on body diagonals. There are two tetrahedral voids on each body diagonal at 14th of the distance from each corner.

So, total number of tetrahedral voids = (no. of tetrahedral voids per body diagonal) x (no. of body diagonals) = 2×4=8

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