Total number of voids per unit cell if a metal crystallises into hcp is (1) 4 (2) 12 (3)18 (4) 8

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The number of tetrahedral voids per unit cell in NaCl crystal is ......

(a) 4

(b) 8

(d) four times the number of octahedral voids

The total number of tetrahedral voids in the face centred unit cell is ................

(a) 6 (b) 8 (c) 10 (d) 12

60 %

40 %

In the cubic close packing, the unit cell has

(a) 4 tetrahedral voids each of which is shared by four adjacent unit cell

(b) 4 tetrahedral voids within the unit cell

(d) 8 tetrahedral voids within the unit cells

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