CUET · CHEMISTRY · PYQ PAPER 2023
The correct statement (s) for cubic close packed (ccp) three dimensional structure are :
(A) The number of the neighbours of an atom present in the top most layer is 12.
(B) The efficiency of atom packing is \(74\%\).
(C) The number of octahedral and tetrahedral voids per atom are 1 & 2, respectively.
(D) The unit cell edge length is \(2\sqrt{2}\) times the radius of the atom.
(E) The metals like Be, Cd, Mg, Zn have cubic close packed (ccp) structure.
Choose the correct answer from the options given below :
- A (A), (B), (C) and (D) Only
- B (A), (C) and (B) Only
- C (A), (C) and (E) Only
- D (B), (A) and (E) Only
Answer & Solution
Correct Answer
(A) (A), (B), (C) and (D) Only
Step-by-step Solution
Detailed explanation
(A) Coordination number in ccp is 12. (B) Packing efficiency is \(74\%\). (C) Octahedral voids per atom are 1, tetrahedral voids per atom are 2. (D) Unit cell edge length \(a = 2\sqrt{2}r\). (E) Be, Cd, Mg, Zn are hcp, not ccp. (A), (B), (C) and (D) Only
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