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Question 860004
JEE Chemistry · Medium

d- and f-Block Elements: Catalytic properties MCQ

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Catalytic propertiesMediumQuestion 860004

Question

Transition metals and their compounds are excellent catalysts because of:
  1. A
    Variable oxidation states allowing electron transfer AND ability to adsorb reactants on surfaces
    Correct
  2. B
    High melting points
  3. C
    Being noble metals
  4. D
    Large atomic radii

Correct answer

Variable oxidation states allowing electron transfer AND ability to adsorb reactants on surfaces

Explanation

Transition metal catalysts work by: (1) changing oxidation state (homogeneous catalysis: Fe²⁺/Fe³⁺ in Fenton's reagent), (2) adsorbing reactants on d-orbital-rich surfaces (heterogeneous: Fe in Haber, Pt in Ostwald).

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