Question

Arrange decreasing order of ionic character mgo,k2o,lif

Answer 1

the key here is that there are 3 F atoms in ClF3 and only two O atoms in SO2.... and as already told you that the difference b/w the electronegativity of F and O is bit high....so definitely ClF3 will be more ionic than SO2....

when you arrange all of them now...

N2 < SO2 < ClF3 < K2O < LiF

 

ClF3 is more ionic than SO2 ..

i think the given solution in the problem you have given is incorrect , maybe a printing mistake , but here is the solution above.

 

source : it came for my school exam , and i got it right :D