Transition and Inner Transition Elements
- The spin-only magnetic moment of Fe2+ ion (Z of Fe = 26) is Answer: A. 4.90 BM Fe²⁺ is 3d⁶ with 4 unpaired electrons: μ=√(4×6)=√(24)≈4.90 BM. 1
- In acidic medium, the number of moles of KMnO4 required to oxidise 1 mole of Fe2+ to Fe3+ is Answer: A. 0.2 mathrmMnO₄^-+5Fe²⁺+8H^+→ Mn²⁺+5Fe³⁺+4H₂O ; 1 mol Fe²⁺ needs 1/5 mol MnO₄⁻. 1