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Transition elements shows catalytic prop...

Transition elements shows catalytic property. Give two reason.

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(i) Are those compounds formed when small atoms like H,C or N are trapped inside the crystal lattice of the metal.
(ii) 1. Tendency to exhibit variable (multiple) oxidation state (valencies)
2. Presence of vacant d-orbitals.
3. The presence of defects in their crystal lattice.
4. Tendency to form reaction intermediates with reactants.
5. They provide large surface area with free valencies.
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