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Q)

The Vacant space in body centered cubic lattice b.c.c unit cell is about

$(a)\;32\%\qquad(b)\;10\%\qquad(c)\;23\%\qquad(d)\;46\%$

2 Answers

Comment
A)
In b.c.c structure $68\%$ of the available volume is occupied by spheres. Thus vacant space is $32\%$
Hence answer is (a)

Comment
A)
option A is correct ,as bcc has packing effiency 68%