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

In the variable oxidation states of Mn, the most stable in acidic aqueous solution is:

Answer: Mn2+.

  • A Mn2+
  • B Mn3+
  • C MnO4-
  • D MnO42-

Correct answer: A. Mn2+

Explanation: Mn2+ ([Ar]3d5) is the most stable oxidation state in acidic conditions due to the extra stability of the half-filled d5 configuration.

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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