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Atom X occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice.

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Atom X occupies the fcc lattice sites as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in %) of the resultant solid is closed to

(A) 25

(B) 35

(C) 55

(D) 75

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Correct option is (B) 35

Packing fraction = number of atoms volume of one atom / volume of unit cell x 100%

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