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A binary solid (AB) has a rock salt structure. If the edge length is 400 pm, and radius of cation is 80 pm the radius of anion is:

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100 pm

120 pm

250 pm

325 pm

answer is B.

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Detailed Solution

a=2(r₊ + r_-)

400=2( 80 + r_-)

radius of anion = 120 pm

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