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🧪 Chemistry  ·  d- and f-Block Elements  ·  NEET & JEE

Among Ti3+, V3+, Cr3+ and Mn2+, the ion with the highest spin-only magnetic moment is:

Answer: Mn2+.

  • A Ti3+
  • B Mn2+
  • C Cr3+
  • D V3+

Correct answer: B. Mn2+

Explanation: Mn2+ is d5 with 5 unpaired electrons (5.92 BM), more than Ti3+ (d1), V3+ (d2) or Cr3+ (d3).

Colours of Common Transition Metal Ions (Aqueous)Cu²⁺ blueFe²⁺ pale greenFe³⁺ brown-yellowMn²⁺ pale pinkNi²⁺/Cr³⁺ greenColour arises from d-d electron transitions - d⁰ ions like Sc³⁺, Ti⁴⁺ are colourless

Aqueous solutions of transition metal ions show characteristic colours caused by electrons absorbing visible light to jump between split d-orbitals; the exact colour depends on the metal, its oxidation state, and surrounding ligands.

Concept context

Transition metals (d-block) and lanthanides/actinides (f-block). Known for coloured compounds, variable oxidation states, complex formation, and catalytic properties. Frequently tested in JEE and NEET.

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