Amongst
and
and
are diamagnetic and
is paramagnetic.
and
are diamagnetic and
is paramagnetic.
and
are diamagnetic and
is paramagnetic.
is diamagnetic and
and
are paramagnetic.
As we learnt in
Diamagnetism -
When substance unaffected by a magnetic field or the central metal atom doesn't have unpaired e- called Diamagnetic substance or character.
- wherein
No unpaired e-
Paramagnetism -
When a substance is attracted by a magnetic field or have unpaired e- called paramagnetic substance.
- wherein
5 unpaired e-
Lets take each species individually
Ni (CO)4 : Ni config: 3d10 and 4s0
CO is a strong ligand
CN- is a strong Ligand
Cl- is a weak Ligand
As we can see, only has unpaired electrons.
Option 1)
and
are diamagnetic and
is paramagnetic.
This answer is incorrect
Option 2)
and
are diamagnetic and
is paramagnetic.
This answer is incorrect
Option 3)
and
are diamagnetic and
is paramagnetic.
This answer is correct
Option 4)
is diamagnetic and
and
are paramagnetic.
This answer is incorrect