The Solid State — Chemistry STD 12 Science — Question
Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State1 Mark
MCQ
Packing efficiency of hcp structure is $.....:$
A
$68\%$
B
$52.4\%$
✓
$74\%$
D
$82\%$
✓
Answer
Correct option: C.
$74\%$
Both $\text{ccp}$ and $\text{hcp}$ are highly efficient lattice; in terms of packing. The packing efficiency of both types of close packed structure is $74\%,$ i.e. $74\%$ of the space in $\text{hcp}$ and $\text{ccp}$ is filled. The $\text{hcp}$ and $\text{ccp}$ structure are equally efficient; in terms of packing.
The packing efficiency of simple cubic lattice is $52.4\%.$ And the packing efficiency of body centered cubic lattice $(\text{bcc})$ is $68\%.$
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