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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.......

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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.......

(A) 100 pm

(B) 125 pm

(C) 250 pm

(D) 325 pm

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Correct answer is: (B) 125 pm

r+ + r– = \(\cfrac{400}{2}\) = 200 pm

\(\therefore\) r– = 200 – 75 = 125 pm

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