Question:
Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (At. no. of Zn = 30, Cr = 24, Co = 27, Ni = 28)
Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (At. no. of Zn = 30, Cr = 24, Co = 27, Ni = 28)
Updated On: Apr 18, 2024
- $[Zn(NH_3)_6]^{2+}$
- $[Cr(NH_3)_6]^{3+}$
- $[Co(NH_3)_6]^{3+}$
- $[Ni (NH_3)_6]^{2+}$
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The Correct Option is C
Solution and Explanation
In $[Co(NH_3)_6]^{3+}$, oxidation state of $Co = +3$ and its coordination number is six.
$_{27}Co = 1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^7,4s^2$
$Co^{3+} = 1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^6$
$[Co (NH_3)_6 ]^{3+}$ is an inner orbital complex as well as diamagnetic in behaviour (due to absence of unpaired electrons).
$[Zn(NH_3)_6]^{2+} \rightarrow sp^3 d^2$ hybridisation (outer orbital and diamagnetic).
$[Cr(NH_3)_6]^{3+} \rightarrow d^2 sp^3$ hybridisation (inner orbital and paramagnetic).
$_{27}Co = 1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^7,4s^2$
$Co^{3+} = 1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^6$
$[Co (NH_3)_6 ]^{3+}$ is an inner orbital complex as well as diamagnetic in behaviour (due to absence of unpaired electrons).
$[Zn(NH_3)_6]^{2+} \rightarrow sp^3 d^2$ hybridisation (outer orbital and diamagnetic).
$[Cr(NH_3)_6]^{3+} \rightarrow d^2 sp^3$ hybridisation (inner orbital and paramagnetic).
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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.