1.

A binary solid `(A^(+)B^(+))` has a rock sell structure .If the edge length is `400 pm` and radius of cation is 75 pm the radius of amion attion isA. 100 pmB. 125 pmC. 250 pmD. 325 pm

Answer» Correct Answer - b
Rock salt - simple cubic
`r_(A)^(+) + r_(B)^(-) = (a)/(2)`
`75 + r_(B)^(-) = (400)/(2)`
`r_(B)^(-) = 200 - 75 = 125` pm


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