Answer: Nuclear fuel and nuclear weapons.
- A Nuclear fuel and nuclear weapons
- B Industrial catalysts for hydrogenation reactions
- C Stainless steel alloys requiring corrosion resistance
- D Permanent magnets used in electric motors
Correct answer: A. Nuclear fuel and nuclear weapons
Explanation: Uranium (235U) undergoes fission and is used as nuclear reactor fuel; enriched uranium is used in nuclear weapons.
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.