Question

The spin-only magnetic moment of sodium nitroprusside ion is :

• A. 3.9 BM
• B. 5.9 BM
• C. 0 BM
• D. 1.8 BM

Answer 1

Answer: (C)

0 BM

Nitroprusside ion is $\left[\stackrel{\Pi }{Fe}\right(CN{)}_5\left(\stackrel{+}{N}O\right){]}^{2-}$.

Hence, $F{e}^{2+}$ ion $\left(3d^6\right)$ with five strong field ligand $\left(C{N}^{-}\right)$ and $N{O}^{+}$ makes the system diamagnetic (no unpaired electrons).