Correct order of spin only magnetic moment of the following complex ions is: (Given At. No. Fe : 26 , Co : 27 )

Step-by-step solution

(1) FeF 6 3 - :   Fe 3 + = 3 d 5   ( Δ O < P ) Number of unpaired e - = 5 μ   =   n ( n + 2 )   BM ∴ μ = 35   BM (2) CoF 6 3 - :   Co 3 + = 3 d 6 Δ O < P Number of unpaired e - = 4 μ   =   n ( n + 2 )   BM ∴ μ = 24   BM (3) Co C 2 O 4 3 3 - :   Co 3 + = 3 d 6 Δ O > P Number of unpaired e - = 0 μ   =   n ( n + 2 )   BM ∴ μ = 0   BM So, the correct order is FeF 6 3