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The percentage of empty space in a body centred cubic arrangement is :
A. 74
B. 68
C. 32
D. 26

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Correct Answer - C
Packing efficiency for bee arrangment is 68% which represents total filled space in the unit cell. Hence, empty space in a body centred arrangement is 100-68=32%.
Note Here, empty space in bcc arrangement is asked therefore empty space in any crystal packing can be calculated as empty space-in unit cell=100-packing efficiency

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