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Jagdish Kothari
Asked: 2022-11-03T07:21:58+05:30 In:

In a AB unit cell (Rock salt type) assuming `A^(+)` forming fcc :
A. The nearest neighbout of `A^(+)` is `6B^(-)` ion
B. The nearest neighbour of `B^(-)` is `6A^(+)` ion
C. The nearest neighbour of `B^(-)` is `6A^(+)` ion
D. The packing fraction of AB crystal is `(sqrt(3)pi)/(8)`

In a AB unit cell (Rock salt type) assuming `A^(+)` forming fcc :
A. The nearest neighbout of `A^(+)` is `6B^(-)` ion
B. The nearest neighbour of `B^(-)` is `6A^(+)` ion
C. The nearest neighbour of `B^(-)` is `6A^(+)` ion
D. The packing fraction of AB crystal is `(sqrt(3)pi)/(8)`
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1 Answer

  1. Correct Answer – A::B::C
    In AB which in NaCl type crystal
    (a) Here `A^(+)` is surrounded by 6 `B^(-)` because `A^(+)` is in octahedral void of `B^(-)`. Is in octahedral void of `A^(+)`.
    (c) The second neighbouring of `A^(+)=12A^(+)` ions
    The packing fraction of `A^(+)=sqrt(3)/(8)pi` and not of the whole All crystal. Choice (a) is correct Choice (b) is correct Choice (c) is correct, Choice (d) is incorrect.

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