Question

Which complex is more stable between $\left[Fe\right(CN{)}_6{]}^{4-}$ and $\left[Fe\right(CN{)}_6{]}^{3-}$?

Answer 1

$\left[Fe\right(CN{)}_6{]}^{4-}$

$F{e}^{+2}$ Ion

$C{N}^{-}$ strong field ligand

Refer IMAGE $01$.

Spin multiplicity $=2s+1=1$

$\left[Fe\right(CN{)}_6{]}^{3-}$

$F{e}^{+3}$ Ion

$C{N}^{-}$ strong field ligand

Refer IMAGE $02$.

Spin multiplicity $=2s+1=2\times \frac{1}{2}1=2$

So, greater the spin multiplicity, greater the stability.

So, the given statement is false, i.e., $0$