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JEE Main levelOne or more correct optionsDifficulty 2 of 3ss084

Which statements about close packing of identical spheres are correct?

  1. AThe number of tetrahedral voids equals the number of spheres.
  2. BThe number of octahedral voids equals the number of spheres.
  3. Cccp has the stacking ABCABC....
  4. Dhcp and ccp both have coordination number 12.

Answer: B, C, D

ccp repeats every three layers (ABC), while hcp repeats every two. Both have CN 12 and 74% packing. There are octahedral and tetrahedral voids, so the last statement is wrong.
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