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FCC unit cell a cube is formed by joining the centres of all the tetrahedral voids to generate a new cube. Then the new cube would contain voids as :

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1 full Tetrahedral voids, 1 full Octahedral void

1 full Tetrahedral void only

8 full Tetrahedral voids and 1 full Octahedral void

1 full Octahedral void only

answer is A.

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Detailed Solution

At the cube's corners, there will be brand-new tetrahedral voids.

Tetrahedral voids have an effective number of $= 8 \times \frac{1}{8} = 1$

The body's core will have an octahedral vacuum.
One octahedral vacancy in total.

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