Question

Why do Transition Metals act as good catalysts and form a large number of complex compounds?

Hint:

Key idea: Variable oxidation states + d-orbitals = catalysis and complex formation.

Answer 1

Concept: Transition metals have unique electronic configurations and variable oxidation states, which make them suitable for catalysis and complex formation.
Answer:
Catalytic Activity:

• Variable Oxidation States: Transition metals can easily change oxidation states, helping in redox reactions.
• Formation of Intermediates: They form unstable intermediate compounds, lowering activation energy.
• Surface Adsorption: Metals like Fe, Ni, and Pt adsorb reactants on their surface, facilitating reactions.

Formation of Complex Compounds:

• Small Size and High Charge Density: Enables strong attraction with ligands.
• Availability of d-Orbitals: Vacant d-orbitals allow coordinate bond formation.
• Variable Oxidation States: Allows formation of different complexes.

Thus, the electronic structure and chemical properties of transition metals make them effective catalysts and capable of forming numerous complex compounds.