The calculated spin-only magnetic moments

Question:

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]_{2}$ and $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$, respectively, are :

  1. $4.9$ and 0

  2. $2.84$ and $5.92$

  3. 0 and $4.9$

  4. 0 and $5.92$


Correct Option: , 3

Solution:

Complex is $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$

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