Question

Which of the following descriptions about $\lbrack FeCl_{6}\rbrack^{4 -}$is correct about the complex ion?

• A. $sp^{3}d,$ inner orbital complex, diamagnetic
• B. $sp^{3}d^{2},$ outer orbital complex, paramagnetic
• C. $d^{2}sp^{3},$ inner orbital complex, paramagnetic
• D. $d^{2}sp^{3},$ outer orbital complex, diamagnetic

Answer 1

Answer: (B)

$sp^{3}d^{2},$ outer orbital complex, paramagnetic

Answer 2

In $\lbrack FeCl_{6}\rbrack^{4 -}$oxidations state of Fe = +2, $Fe^{2 +} = 3d^{6}$

Paramagnetic due to presence of four unpaired electrons.