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NEETChemistryd and f Block Elements

Which of the following catalyst-reaction pairs is incorrectly matched?

Options

  1. AMnO ₂ : Decomposition of KClO ₃
  2. BTiCl ₄ with Al ( CH ₃)₃ : Polymerisation of ethene
  3. CFinely divided Ni : Catalytic hydrogenation of unsaturated hydrocarbons
  4. DZn ²⁺ : Oxidation of iodide to iodine by persulphate

Correct answer

D. Zn ²⁺ : Oxidation of iodide to iodine by persulphate

Step-by-step solution

Transition metals and their compounds act as good catalysts due to their ability to adopt multiple oxidation states and form complexes. MnO ₂ is used as a catalyst in the decomposition of KClO ₃ to yield oxygen gas. TiCl ₄ with Al ( CH ₃)₃ forms the Ziegler-Natta catalyst, which is used for the polymerisation of ethene. Finely divided Ni is widely used as a catalyst in the hydrogenation of unsaturated hydrocarbons (alkenes and alkynes). The oxidation of iodide to iodine by persulphate is catalysed by Fe ³⁺ , not Zn

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