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 .

Options

A. `RltQltP`
B. `QltRltP`
C. `RltPltQ`
D. `QltPltR`

Answer

B

Explanation

`P=[FeF_(6)]^(3-)` has `Fe^(3+)`, i.e., `3d^(5)` (5 unpaired electron)
`Q=[V(H_(2)O)_(6)]^(2+)` has `V^(2+)`, i.e., `3d^(3)` (3 unpaired electrons)
`R=Fe(H_(2)O)_(6)]^(2+)` has `Fe^(2+)`, i.e., `3d^(6)` (4 unpaired electrons)
Hence, the order of spin only magnetic moment is `QltRltP`.