What is the number of tetrahedral voids in FCC Unit cell?

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Q. In fcc structure, the number of tetrahedral voids present along the edges of the fcc unit cell is:

Q. Distance between two tetrahedral voids in FCC unit cell is:

Q.

In which of the following structures coordination number for cations and anions in the packed structure will be same ?

(a) $C{l}^{-}$ ions form fcc lattice and $N{a}^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C{a}^{2+}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(c) $O^{2-}$ ions form fcc lattice and $N{a}^{+}$ ions occupy all the eight tetrahedral voids of

(d) $S^{2-}$ ions form fcc lattice and $Z{n}^{2+}$ ions go into alternate tetrahedral voids of the unit cell

Q. How many of the following statement(s) is/are incorrect regarding tetrahedral voids in fcc lattice?
a) Each body diagonals contains 2 tetrahedral voids
b) Each tetrahedral void contributes $\frac{1}{4^{th}}$ part to a unit cell
c) One tetrahedral void is present at the body centre of unit cell
d) Each face diagonals contains 2 tetrahedral voids