In which of the following complex ion, the central metal ion is in a state of $sp^3d^2$ hybridisation ?
- $[CoF_6] 3^ {3-}$
- $[Co(NH_3 )_ 6 ] ^{3+}$
- $[Fe(CN)_6]^{3-}$
- $[Cr(NH_3)_6]^{3+}$
The Correct Option is A
Solution and Explanation
$F ^{-}$ is a weak ligand. It cannot pair up electrons with $d$ -subshell and forms outer orbital octahedral complex. $\left[ Co \left( NH _{3}\right)_{6}\right]^{3+}$ ion
$\left[ Fe ( CN )_{6}\right]^{-3}$ ion
$\left[ Cr \left( NH _{3}\right)_{6}\right]^{3+} $ ion
$NH _{3}$ and $CN ^{-}$ are strong ligands. So, they form inner orbital complex.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.