Arrange the following in the increasing order of their magnetic moments I. $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$ II. $\left[\mathrm{Mn} \mathrm{Cl}_6\right]^{3-}$ III. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$ IV. $\left[\mathrm{FeF}_6\right]^{3-}$

• A

  III $ \lt $ I $ \lt $ IV $ \lt $ II
• B

  III $ \lt $ IV $ \lt $ II $ \lt $ I
• C

  IV $ \lt $ II $ \lt $ I $ \lt $ III
• Correct answer
  D

  III $ \lt $ I $ \lt $ II $ \lt $ IV

Solution

$\mathrm{x}=\mathrm{IV}\gt\mathrm{II}\gt\mathrm{I}\gt\mathrm{III} .$

Hence, the correct answer is option: 'D'.