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  4. AB crystallizes in a body centred cubic lattice with edge length ‘a’ equal to 387 pm. The distance between two oppositively charged ions in the lattice is

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Q. AB crystallizes in a body centred cubic lattice with edge length ‘a’ equal to 387 pm. The distance between two oppositively charged ions in the lattice is

NTA AbhyasNTA Abhyas 2022

Solution:

For BCC
$r^{+}+r^{-}=\frac{\sqrt{3} a}{2}$
$r^{+}+r^{-}=\frac{\sqrt{3} \times 387}{2}pm=335.14pm\approx335pm$