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A binary solid ($A^+B^-$) has a rock salt structure. If the edge length is 400 pm, and radius of cation is 75 pm the radius of anion is

1 Answer

Edge =$2(r^++r^-)$
$\Rightarrow 400=2(75+r^-)$
$\therefore r^-=125pm$
Hence (B) is the correct answer.
answered May 30, 2014 by sreemathi.v

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