First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family: (1) 1012 kJ mol⁻¹$1012\text{ kJ mol}^{-1}$ (2) 1402 kJ mol⁻¹$1402\text{ kJ mol}^{-1}$ (3) 834 kJ mol⁻¹$834\text{ kJ mol}^{-1}$ (4) 947 kJ mol⁻¹$947\text{ kJ mol}^{-1}$

Core Logic

Statement I and II are False.

Noble gases have low boiling points. Noble gases are held together by weak dispersion forces.

Pattern Recognition

Noble gases are characterized by extremely weak intermolecular forces (London dispersion forces) because they are monoatomic and non-polar, which directly results in very low boiling and melting points.

Chapter Mix

Class 12 Chemistry: The p-Block Elements

Core Logic

In Group 14 elements, the nature of oxides varies down the group: CO$CO$ is neutral. CO₂$CO_2$ and SiO₂$SiO_2$ are acidic. GeO₂$GeO_2$ is distinctly acidic. SnO₂$SnO_2$ and PbO₂$PbO_2$ are amphoteric.

Pattern Recognition

Tin (Sn$Sn$) and Lead (Pb$Pb$) mostly form amphoteric oxides (e.g., SnO, SnO₂, PbO, PbO₂$SnO, SnO_2, PbO, PbO_2$), distinguishing them from the acidic oxides of Carbon and Silicon.

Chapter Mix

Class 11 Chemistry: The p-Block Elements