Question

Which of the following descriptions about $[FeC{l}_6{]}^{4-}$ is correct about the complex ion?

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

Answer 1

Answer: (B)

In $[FeC{l}_6{]}^{4-}$ oxidation state of $Fe=+2,F{e}^{2+}=3d^6$
$[FeC{l}_6{]}^{4-}$ :
Paramagnetic due to presence of four unpaired electrons.