Q.

The number of octahedral and tetrahedral sites in a cubical close packed array of N spheres respectively is

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a

N and 2N

b

N/2 and N

c

2N and N

d

4N and 2N

answer is A.

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Detailed Solution

Number of octahedral sites =  number of spheres in packingNumber of tetrahedral voids = 2 × number of spheres in packingNumber of tetrahedral voids = 2 × octahedral voidsSo, the answer is N and 2N.
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