The spin-only magnetic moment value (in BM) of is:

Question

The spin-only magnetic moment value (in BM) of  is:

Canvas Classes · Accepted Answer

:

Oxidation state of Cr: CO is a neutral ligand → Cr = 0

Configuration of Cr(0):  → 6 valence electrons

CO is a strong field ligand → causes maximum pairing (low-spin).

In octahedral field with strong field CO:

All 6 electrons are paired in  → 0 unpaired electrons

is diamagnetic (18-electron rule satisfied).

Answer: Option (2) — 0 BM

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