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If the density of a unit cell of a salt ...

If the density of a unit cell of a salt AB (rock salt type structure) is 4 g/cm3, then the distance of closest approach between `A^(+)and B^(-)` will be (Molar mass of `AB = 75 g mol^(-1)` and `N_A= 6 xx 10^(23)`

A

`1.82 A°`

B

`3.7A°`

C

`2.5 A°`

D

4.8 A

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