A solid AB has square planar structure. If the radius of cation A+ is 120pm, calculate the maximum possible value of anion B- (A) 290 pm (B) 280 pm (C) 270 pm (D) 240 pm

A solid AB has square planar structure. If the radius of cation A+ is 120pm, calculate the maximum possible value of anion B-

(A) 290 pm
(B) 280 pm
(C) 270 pm
(D) 240 pm

Option A is the correct answer. Explanation:

Square planar means ratio ratio is between 0.414 – 0.732

If radius of cation is 120 pm then anion should be in the range ρ = rcation/ranion

0.414 = `"120"/"x"` so x = 289.8 = 290 pm

0.732 = `"120"/"x"`

so x = 163.9 = 164 pm