Answer: Hard, high melting point, conduct electricity but chemically inert (e.g., TiC, WC).
- A Hard, high melting point, conduct electricity but chemically inert (e.g., TiC, WC)
- B Simple ionic compounds held together by electrostatic lattice forces according to conventional understanding
- C Discrete molecular compounds with well-defined low melting points in routine practice
- D Readily soluble compounds that dissolve largely in water overall in most cases
Correct answer: A. Hard, high melting point, conduct electricity but chemically inert (e.g., TiC, WC)
Explanation: Interstitial compounds trap small atoms (C, N, H) in the holes of the metallic lattice; they are harder, higher melting, and less reactive than the parent metal.
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.