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\( \mathrm{CsCl} \) crystallises in body centred cubic lattice. If ' \( \mathrm{a} \) ' is its edge length then which of the following expressions is correct?
(A) \( r_{\mathrm{Cs}^{+}}+r_{\mathrm{Cl}^{-}}=3 a \)
(B) \( r_{\mathrm{CS}^{+}}+r_{\mathrm{Cl}^{1}}=\frac{3 a}{2} \)
(C) \( r_{\mathrm{Cs}^{+}}+r_{\mathrm{Cl}^{-}}=\frac{\sqrt{3}}{2} a \)
(D) \( r_{\mathrm{Cs}^{+}}+r_{\mathrm{Cl}^{-}}=\sqrt{3 a} \)
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