11 public questions tagged with this topic.
Bond angles in group 15 hydrides (NH₃, PH₃, AsH₃, SbH₃) decrease down the group due to reduced hybridization. NH₃ (107°) has the highest bond angle.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy
Electronegativity decreases down group 15. N (period 2, 3.0) has the highest value among N, P, As, and Sb.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
All group 15 elements can exhibit a +5 oxidation state, but N achieves it most prominently (e.g., in HNO₃) due to its small size and high electronegativity, unlike P, As, or Sb.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
In group 15, As is a metalloid, while N (non-metal), P (non-metal), and Bi (metal) are not.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Atomic radius increases down a group. Among N, P, As, and Sb (group 15), N (period 2) has the smallest radius.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Covalent radius increases down group 15 due to additional electron shells. Order: N < P < As < Sb.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Nomenclature of Elements with Atomic Number >100
Covalent character (Fajans’ rule) increases with smaller size and higher charge density. NCl₃ (N, smallest) has the highest covalent character among N, P, As, and Sb trichlorides.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Group 15 elements (N, P, As, etc.) form hydrides like NH₃. CH₄ (group 14), H₂O (group 16), and HCl (group 17) are from other groups.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Electronegativity decreases down group 15 due to increasing size. Bi (period 6) has the lowest value among N, P, As, and Bi.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Group 15 elements form acidic oxides, especially higher oxides. P forms P₂O₅, which is acidic, unlike Be (basic), Ca (basic), or Zn (amphoteric).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
