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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 packing fraction of AB crystal is 0.79

B

The nearest neighbour of `A^(+)` is `6B^(-)ion`

C

The nearest neighbour of `B^(-)` is 6A(+) ion`

D

The second neighbour of `A^(+)` is `12A^(+)`

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The correct Answer is:
A, B, C
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