Answer: They have accessible multiple oxidation states that allow electron transfer cycles, and they can adsorb and activate substrates.
- A They have accessible multiple oxidation states that allow electron transfer cycles, and they can adsorb and activate substrates
- B Catalytic activity is said to generally correlate with how expensive each particular metal happens to be as generally observed
- C Their generally large atomic weights are what is said to account for their catalytic ability in typical laboratory settings
- D Every transition metal catalyst is said to necessarily be an inherently paramagnetic species under usual circumstances according to most researchers
Correct answer: A. They have accessible multiple oxidation states that allow electron transfer cycles, and they can adsorb and activate substrates
Explanation: Transition metals can accept and donate electrons (cycling oxidation states) and adsorb molecules on their surfaces or form unstable intermediates, lowering activation energy.
Aqueous solutions of transition metal ions show characteristic colours caused by electrons absorbing visible light to jump between split d-orbitals; the exact colour depends on the metal, its oxidation state, and surrounding ligands.
Concept context
Transition metals (d-block) and lanthanides/actinides (f-block). Known for coloured compounds, variable oxidation states, complex formation, and catalytic properties. Frequently tested in JEE and NEET.