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Percentage of free space in cubic close packed structure and in body centered packed structure are respectively:

$(a)\;30\%\;and\;26\%\qquad(b)\;26\%\;and\;32\%\qquad(c)\;32\%\;and\;48\%\qquad(d)\;48\%\;and\;26\%$

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Packing fraction of cubic close packing and body centrered packing are 0.74 and 0.68 respectively. So , Vaccant space is $26\%\; and\; 32\%$ respectively
Hence answer is (b)
answered Feb 17, 2014 by sharmaaparna1
 
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