Which of the following pairs will show the same magnetic moment (‘spin only’)?
Text Solution
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Cr 3+ , 3d 3 ; sp 3 d 2 hybridisation with three unpaired electrons (weak field as well as strong field ligand).
Fe + , 3d 7 ; sp 3 d 2 hybridisation with three unpaired electron (one 4s electron jumps to 3d orbital for the pairing)
Mn 2+ , 3d 5 ; d 2 sp 3 hybridisation with one unpaired electron after pairing (CN – is strong field ligand).
Fe 3+ , 3d 5 ; d 2 sp 3 hybridisation with one unpaired electron after pairing (CN – is strong field ligand).
Ni, 3d 8 4s 2 ; sp 3 hybridisation and all electrons are paired because CO is strong field ligand (4s-electrons jumps to 3d-orbitals for the pairing)
Zn 2+ , 3d 10 ; sp 3 hybridisation and all electrons are paired.
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