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a
CoF63-
b
Ni(CN)42-
c
NiCl42-
d
Fe(CN)63-
answer is B.
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Detailed Solution
In Ni(CN)42- all orbitals are doubly occupied, hence, it is diamagnetic.CN- is a strong ligand and causes pairing of 3 d -electrons of Ni2+FeCN6-3 has one one paired electron….paramagnetic