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The INCORRECT statement (S) regarding cubic close packing of atom is (are):(Given radius of atom is r)

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The distance between the nearest tetrahedral and octahedral voids in

32 r

The distance between the surfaces of atoms along an edge is

2 (2 − 1) r

The distance between two nearest octahedral voids is 2r

The distance between two nearest tetrahedral voids is

6 r

answer is B.

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Detailed Solution

a) Distance between nearest octahedral voids=distance between body centre & edge centre

3 a 2 2 = X 2 + a 2 2 × 2 r (a = 22 r)

b) Distance between two nearest td void
Question Image

TETRAHEDRAL VOIDS IN ONE UNIT CELL
c)

2 r v + 2 r = a

× + 2 r = a × = a − 2 r = 2 (2 − 1) r

d) Distance between two nearest oh voids

= 3 a 4 = 32 r

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