Question

The percentage of empty space in a body centred cubic arrangement is ________.
(i) 74
(ii) 68
(iii) 32
(iv) 26

NCERT Class XII
Chemistry - Exemplar Problems

Chapter 1. Solid State

Answer 1

The percentage of an empty space in a body centred cubic (BCC) arrangement is 32.

• The packing efficiency for the arrangement of Body Centred Cubic (BCC) is normally 68%.
• In the unit cell, the total filled space is represented by the BCC.
• Therefore, the empty space in a body centered arrangement is calculated as - 100 – 68 = 32. Thus it is 32%

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