JEE Mains 2018: Question 41:
The correct order of ionic radii of the following species is:
(A) [Fe(CN)6]4- < [Fe(CN)6]3- < [Fe(CN)6]2- < [Fe(CN)6]-
The correct answer is (A).
The ionic radii of [Fe(CN)6]4-, [Fe(CN)6]3-, [Fe(CN)6]2- and [Fe(CN)6]- decrease in the order:
[Fe(CN)6]4- > [Fe(CN)6]3- > [Fe(CN)6]2- > [Fe(CN)6]-
This is because the more the number of ligands, the greater the crystal field splitting, and the smaller the ionic radius.
JEE Mains 2017: Question 38:
Which of the following compounds is expected to be coloured?
(A) [Ti(H2O)6]3+ (B) [Ni(
