If N is the number of spheres in the unit cell, then total no. of tetrahedral voids is

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N/2

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Solution

The correct option is B
2N

We know that the no. of tetrahedral voids is twice the number of particles in a given unit cell.

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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

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

If N is the number of spheres in the unit cell, then total no. of octahedral voids is the cell is

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