Question

Which of the following descriptions about $[FeCl_{6}]^{4-}$ 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)

In $[FeCl_{6}]^{4-}$ oxidation state of $Fe = +2, Fe^{2+ } = 3d^{6}$
$[FeCl_{6}]^{4-}$ :
Paramagnetic due to presence of four unpaired electrons.