1.

Consider the follwing complexes ion `P,Q` and `R` `P =[FeF_(6)]^(3-), Q=[V(H_(2)O)_(6)]^(2+)` and `R=[Fe(H_(2)O)_(6)]^(2+)` The correct order of the complex ions, according to their spin only magnetic moment values (inBM) is .A. `R lt Q lt P`B. `Q lt R lt P`C. `R lt P lt Q`D. `Q lt P lt R`

Answer» Correct Answer - B
P = `|FeF_(6)|^(3-)` has `Fe^(3+)` , i.e., `3d^(5)` (5 unpaired electrons)
Q = `|V(H_(2)O)_(6)|^(2+)` has `V^(2+)` , i.e., `3d^(3)` (3unpaired electrons )
R = `|Fe((H_(2)O)_(6)|^(2+)` has `Fe^(2+)` i.e., `3d^(6)` (4 unpaired electrons)
`:.` the order of spin only magnetic moment is `Q lt R lt P` .


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