JEE PYQ: Coordination Compounds Question 7
Question 7 - 2021 (25 Feb Shift 1)
The hybridization and magnetic nature of $[\text{Mn(CN)}_6]^{4-}$ and $[\text{Fe(CN)}_6]^{3-}$, respectively are:
(a) $d^2sp^3$ and paramagnetic (b) $sp^3d^2$ and paramagnetic (c) $d^2sp^3$ and diamagnetic (d) $sp^3d^2$ and diamagnetic
Show Answer
Answer: (a)
Solution
$[\text{Mn(CN)}_6]^{4-}$: Mn$^{2+} = 3d^5$, CN$^-$ strong field, 1 unpaired electron, hybridization $= d^2sp^3$. $[\text{Fe(CN)}_6]^{3-}$: Fe$^{3+} = 3d^5$, CN$^-$ strong field, 1 unpaired electron, hybridization $= d^2sp^3$. Both are paramagnetic.
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