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

The Ziegler-Natta catalyst contains which transition metal?

Answer: Titanium (TiCl4) with organoaluminium compound.

  • A Titanium (TiCl4) with organoaluminium compound
  • B Iron, paired with an organoaluminium co-catalyst instead
  • C Cobalt, paired with an organoaluminium co-catalyst instead
  • D Platinum, paired with an organoaluminium co-catalyst instead

Correct answer: A. Titanium (TiCl4) with organoaluminium compound

Explanation: Ziegler-Natta catalyst: TiCl4 + Al(C2H5)3 (triethylaluminium), used for stereospecific polymerisation of alkenes.

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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