MCQ
The efficiency of packing is $68\%$ in:
  • A
    $\text{Hcp}$ structure
  • B
    $\text{Ccp}$ structure
  • C
    $\text{Fcc}$ structure
  • $\text{Bcc}$ structure

Answer

Correct option: D.
$\text{Bcc}$ structure
$\text{FCC}$ or $\text{CCP}$ packing efficiency $= 74\%$
$\text{HCP}$ Packing Efficiency $= 74\%$
$\text{BCC}$ Packing Efficiency $= 68\%​$

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