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CsCl crystallises in body centred cubic lattice. If ‘a’ is its edge length then which of the following expressions is correct ?

1. + Cs r + – Cl r = 2 a 3
2. + Cs r + – Cl r = a 2 3
3. + Cs r + – Cl r = a 3
4. + Cs r + – Cl r = 3 a

Correct answer: + Cs r + – Cl r = a 2 3

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