Question

The number of tetrahedral and octahedral voids in CCP unit cell are respectively.
A. 4,8
B. 8,4
C. 12,6
D. 6,12

Answer 1

To be exact, if in a nearby pressed structure (ccp or fcc) there are no particles or particles then the number of octahedral voids and tetrahedral voids will be nn and 2n2n separately.

Complete answer:
Presently we have recently observed the storeroom pressing in gem structures. This pressing occurs at three distinct levels, one dimensional, two dimensional, and three dimensional.
Presently we should understand that constituent particles have a circular shape. What's more, the unit cells of a gem cross-section are a block. Thus, when these iotas or particles are stuffed into a 3D shape there will be space between the molecules.
These spaces are known as voids. We see these voids in the two-dimensional structures also. Here there are two sorts of storeroom pressing and two kinds of voids.
Presently there are two kinds of three-dimensional close pressing in precious stones. One such sort is Cubic Close pressing.
Here the two-dimensional structures are stacked in a particular arrangement. The layers substitute with one another. In this way, the subsequent layer will be situated in the downturn of the principal layer. You will see that a triangle-formed void is found in this kind of arrangement.
The circle which is in the downturn will leave a void between itself and the circle in the layer above. This void is the Tetrahedral Void.
Hence the correct answer is Option (A).

Note: The glasslike solids are portrayed by their space cross-sections and close pressing of molecules. Notwithstanding, these structures have a few holes in their course of action we call voids. Numerous researchers accept that this dividing between particles is of vital significance to the properties of the substance.