The correct order of [ FeF _6 ]^ 3- , [ CoF _6 ]^ 3- , [ Ni ( CO )_4 ] and [ Ni ( CN )_4 ]^ 2- complex species based on the number of unpaired electrons present is :

D. [ FeF _6 ]^ 3- > [ CoF _6 ]^ 3- > [ Ni ( CN )_4 ]^ 2- = [ Ni ( CO )_4 ]

The correct order of [ FeF _6 ]^ 3- , [ CoF _6 ]^ 3- , [ Ni ( CO …

MCQ

The correct order of $\left[ FeF _6\right]^{3-},\left[ CoF _6\right]^{3-},\left[ Ni ( CO )_4\right]$ and $\left[ Ni ( CN )_4\right]^{2-}$ complex species based on the number of unpaired electrons present is :

A
$\left[ FeF _6\right]^{3-}>\left[ CoF _6\right]^{3-}>\left[ Ni ( CN )_4\right]^{2-}>\left[ Ni ( CO )_4\right]$
B
$\left[ Ni ( CN )_4\right]^{2-}>\left[ FeF _6\right]^{3-}>\left[ CoF _6\right]^{3-}>\left[ Ni ( CO )_4\right]$
C
$\left[ CoF _6\right]^{3-}>\left[ FeF _6\right]^{3-}>\left[ Ni ( CO )_4\right]>\left[ Ni ( CN )_4\right]^{2-}$
✓
$\left[ FeF _6\right]^{3-}>\left[ CoF _6\right]^{3-}>\left[ Ni ( CN )_4\right]^{2-}=\left[ Ni ( CO )_4\right]$

✓