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Transition elements show catalytic prope...

Transition elements show catalytic property. Give two reasons.

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(a) (i) They show variable oxidation states
(ii) Large surface area
(iii) presence of incompletely filled or partially filled d-orbitals or vacant d-orbital
(iv) Formation of intermediate compounds.
(b) Zinc (Zn) or Scandium (Sc)
(a) Two reasons, because transition elements show catalytic property.
(i) Presence of vacant d-orbitals.
(ii) Ability to exhibit variable valences.
(b) Zinc (Zn) is the element of 3d-series that does not show variable valency (oxidation state) due to as electronic configuration.
Electronic configuration of `Zn : [Ar] 3d^(10) 4s^(2)`.
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