Q.

The number of tetrahedral voids per unit cell in NaCl crystal is……

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a

4

b

8

c

equal the number of octahedral voids

d

four times the number of octahedral voids

answer is B.

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Detailed Solution

NaCl has a rock salt type structure having fcc arrangement.Total number of atoms per unit cell = 4∴Number of tetrahedral voids = 2 x 4 = 8Number of octahedral voids = 4
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