Question

What is the value of effective magnetic moment found in +3 oxidation state of Chromium (Z = 24)?

Options

• 1.73 BM

• 4.90 BM

• 2.84 BM

• 3.87 BM

Answer 1

3.87 BM

Explanation:

$$\mathrm{Cr}{\phantom{A}}^{3+}⟶3\mathrm{d}{\phantom{A}}^3$$ (3 unpaired electrons)

∴ µ = ${\displaystyle \sqrt{\text{n}(\text{n}+2)}=\sqrt{3(3+2)}}$ = 3.87 BM