JEE Main Chemistry Class 12 Co-ordination Compounds Part 1 Questions

(A) Ni(CO)4
Ni=3d84 s2
CO is strong field ligand. So pairing of elections happens.
∴ Number of unpaired electrons =0
∴µ‌spin ‌=0

(B) [Ni(H2O)6]Cl2
Ni+2=3d84s0
H2O is weak field ligand. So no pairing of electrons happens.
Number of unpaired electron =2
∴µ‌spin ‌=√n(n+2)=√2(2+2)=√8‌ B.M ‌

(C) Na2[Ni(CN)4]
Ni+2=3d84 s0
CN−is strong field ligand. So pairing of electrons happens.
Number of unpaired electron =0
∴µ‌spin ‌=0

(D) PdCl2(PPh3)2
Pd2+=4d8
This is dsp2 complex. And shape is square planar.
∴µ spin=0