devarshi-dt-logo

Question:

A solid compound XY has NaCl structure. If the radius of the cation (X+) is 100 pm, the radius (in pm) of the anion (Y-) will be:

275.1

322.5

165.7

241.5

Solution:

Radius ratio of NaCl like crystal = r+/r- = 0.414
Given that r+ = 100 pm
Therefore, 100/r- = 0.414
r- = 100/0.414 = 241.5 pm