Coordination CompoundHard
Question
Which of the following pairs will show the same magnetic moment (′spin only′)?
Options
A.[Cr (H2O)6]3+ and [Fe (H2O)5 NO]2+
B.[Mn (CN)6]4- and [Fe (CN)6]3-
C.[Ni (CO)4] and [Zn (NH3)4]2+
D.All of these
Solution
(A)Cr3+, 3d3 ; sp3d2 hybridisation with three unpaired electrons (weak field as well as strong field ligand).
Fe+ , 3d7 ; sp3d2 hybridisation with three unpaired electron (one 4s electron jumps to 3d orbital for the pairing)
(B) Mn2+, 3d5 ; d2sp3 hybridisation with one unpaired electron after pairing (CN- is strong field ligand).
Fe3+, 3d5 ; d2sp3 hybridisation with one unpaired electron after pairing (CN- is strong field ligand).
(C) Ni, 3d8 4s2; sp3 hybridisation and all electrons are paired because CO is strong field ligand (4s-electrons jumps to 3d-orbitals for the pairing)
Zn2+, 3d10; sp3 hybridisation and all electrons are paired.
Fe+ , 3d7 ; sp3d2 hybridisation with three unpaired electron (one 4s electron jumps to 3d orbital for the pairing)
(B) Mn2+, 3d5 ; d2sp3 hybridisation with one unpaired electron after pairing (CN- is strong field ligand).
Fe3+, 3d5 ; d2sp3 hybridisation with one unpaired electron after pairing (CN- is strong field ligand).
(C) Ni, 3d8 4s2; sp3 hybridisation and all electrons are paired because CO is strong field ligand (4s-electrons jumps to 3d-orbitals for the pairing)
Zn2+, 3d10; sp3 hybridisation and all electrons are paired.
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