Answer: Unpaired electrons in adjacent atoms align parallel in magnetic domains (quantum exchange coupling).
- A Unpaired electrons in adjacent atoms align parallel in magnetic domains (quantum exchange coupling)
- B A significant degree of ionic character present throughout the bulk metal lattice in many documented cases
- C The simple presence of a very large total number of electrons within each metal atom according to conventional understanding
- D The metal's characteristically high melting point compared to other transition metals in routine practice
Correct answer: A. Unpaired electrons in adjacent atoms align parallel in magnetic domains (quantum exchange coupling)
Explanation: Ferromagnetism arises from quantum exchange interactions that cause parallel alignment of unpaired electron spins in magnetic domains, producing a permanent magnetic moment.
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.