JEE Main 2014 Chemistry question

Not in JEE Main or NEET syllabus

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

Answer: (B)

Solution

Cs⁺ at the body centre touches the Cl⁻ ions at the corners along the body diagonal: $

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Question ID VK-008682