Answers to Intext Questions

These are the final answers printed at the end of the NCERT chapter. The book gives answers for some intext questions only — every question below links to our complete worked solution.

4.1 — Silver (Z = 47) can exhibit +2 oxidation state wherein it will have incompletely filled d-orbitals (4d), hence a transition element. · Full solution →

4.2 — In the formation of metallic bonds, no electrons from 3d-orbitals are involved in case of zinc, while in all other metals of the 3d series, electrons from the d-orbitals are always involved in the formation of metallic bonds. · Full solution →

4.3 — Manganese (Z = 25), as its atom has the maximum number of unpaired electrons. · Full solution →

4.4 — answered in the worked solution · Full solution →

4.5 — Irregular variation of ionisation enthalpies is mainly attributed to varying degree of stability of different 3d-configurations (e.g., d⁰, d⁵, d¹⁰ are exceptionally stable). · Full solution →

4.6 — Because of small size and high electronegativity oxygen or fluorine can oxidise the metal to its highest oxidation state. · Full solution →

4.7 — Cr²⁺ is stronger reducing agent than Fe²⁺. Reason: d⁴ → d³ occurs in case of Cr²⁺ to Cr³⁺, but d⁶ → d⁵ occurs in case of Fe²⁺ to Fe³⁺; in a medium (like water) d³ is more stable as compared to d⁵ (see CFSE). · Full solution →

4.8 — answered in the worked solution · Full solution → …