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JEE Main levelOne or more correct optionsDifficulty 2 of 3df033

Select ALL properties of transition metals that contribute to their catalytic activity.

  1. AVariable oxidation states that allow unstable intermediates to form
  2. BAbility to adsorb reactants on the surface using free valencies
  3. CAvailability of vacant or partly filled d orbitals
  4. DComplete absence of unpaired electrons in all of them

Answer: A, B, C

Variable oxidation states, surface adsorption through unused valencies and available d orbitals all enable catalysis. Many transition metals have unpaired electrons, so the last statement is false.
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