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CsCl crystallizes in body centred cubic ...

`CsCl` crystallizes in body centred cubic lattice .If `'a'` is its edge length then which of the following expression is correct?

A

`r_(Cs^(+)) +r_(Cl^(-)) = (sqrt(3))/(2)a`

B

`r_(Cs^(+)) +r_(Cl^(-)) = sqrt(3)a`

C

`r_(Cs^(+)) +r_(Cl^(-)) = 3a`

D

`r_(Cs^(+)) +r_(Cl^(-)) = (3a)/(2)`

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