Question

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 is
A. 100 pm
B. 125 pm
C. 250 pm
D. 325 pm

Answer 1

Correct Answer - B
`2r^(+)+2r^(-)=a=400"pm"`
`r^(-)=1//2(400-2xx75)`
`=1//2(400-150)=125"pm"`