\( \mathrm{CsCl} \) crystallises in a cubic cell that has a \( \mathrm{Cl}^{-} \)at each corner ...

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\( \mathrm{CsCl} \) crystallises in a cubic cell that has a \( \mathrm{Cl}^{-} \)at each corner and \( \mathrm{Cs}^{+} \)at the centre of the unit cell. If radius of \( \mathrm{Cs}^{+} \)is \( 1.69 \mathrm{~A} \) and \( \mathrm{r}_{\mathrm{Cr}}=1.81 \AA \), what is the edge length of unit cell?
(1) \( 3.50 \mathrm{~A} \)
(2) \( 4.04 \mathrm{~A} \)
(3) \( 2.02 \mathrm{~A} \)
(4) \( 1.01 \AA \)
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