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The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State1 Mark
MCQ
In the cubic close packing, the unit cell has $.......$
  • A
    $4$ Tetrahedral voids each of which is shared by four adjacent unit cells.
  • B
    $4$ Tetrahedral voids within the unit cell.
  • C
    $8$ Tetrahedral voids each of the which is shared by four adjacent unit cells.
  • ✓
    $8$ Tetrahedral voids within the unit cells.
✓

Answer

Correct option: D.
$8$ Tetrahedral voids within the unit cells.
We know that in $\text{ccp}$ structure there are $4$ atoms per unit cell. The number of tetrahedral voids is twice the number of atoms $($i.e. eight tetrahedral voids per unit cell of cubic closed packing$.)$

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