# The hybridization and magnetic nature of

Question:

The hybridization and magnetic nature of $\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}$ and $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$, respectively are:

1. $\mathrm{d}^{2} \mathrm{sp}^{3}$ and paramagnetic

2. $\mathrm{sp}^{3} \mathrm{~d}^{2}$ and paramagnetic

3. $\mathrm{d}^{2} \mathrm{sp}^{3}$ and diamagnetic

4. $\mathrm{sp}^{3} \mathrm{~d}^{2}$ and diamagnetic

Correct Option: 1

Solution:

$1 .\left(\mathrm{Mn}(\mathrm{CN})_{6}\right)^{4-}$

$\mathrm{Mn}^{++}=3 \mathrm{~d}^{5}$

$\mu=\sqrt{3}$

hybridization $=\mathrm{d}^{2} \mathrm{sp}^{3}$

2. $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$

$\mathrm{Fe}^{3+}=3 \mathrm{~d}^{5}$

$\mu=\sqrt{3}$