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In a AB unit cell (Rock salt type) as...

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)`

Text Solution

Verified by Experts

The correct Answer is:
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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