A binary solid \( (A B) \) has a rock salt structure. If the edge length is \( 400 \mathrm{pm} \...

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A binary solid \( (A B) \) has a rock salt structure. If the edge length is \( 400 \mathrm{pm} \), and radius of cation is \( 80 \mathrm{pm} \) the radius of anion is:
(a) \( 100 \mathrm{pm} \)
(b) \( 120 \mathrm{pm} \)
(c) \( 250 \mathrm{pm} \)
(d) \( 325 \mathrm{pm} \)
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