WBJEE 2019 Chemistry Solved Paper

(B,C,D)
BCD complex shown spin only magnetic moment equivalent to 5 unpaired electrons.
(A) K4[Mn(CN)6]; Mn2+ = 3d54s0 (in octahedral complex)
CN− ; SFL t2g221eg00 (due to pairing of e− )
(B) [Fe(H2O)6]Cl3 ; Fe+3 = 3d54s0
H2O; WFL So t2g111eg11
(C) K3[FeF6]; Fe+3 = 3d54s0
F− ; WFL, So t2g111eg11
(D) K4[MnF6] ; Mn2+ = 3d54s0
F− ; WFL, So t2g111eg11