The number of tetrahedral and octahedral voids in CCP unit cell are respectively.

4, 8

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8, 4

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12, 6

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6, 12

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Solution

The correct option is B $8, 4$
The number of tetrahedral and octahedral voids in CCP unit cell is $8, 4$ respectively.

The number of particles in ccp $= 4$ . Hence the number of tetrahedral and octahedral voids are $8$ and $4$ respectively.

Note:

The number of tetrahedral voids is twice the number of particles.

The number of octahedral voids is equal to the number of particles.

Hence, the correct option is $B$

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