Many ionic crystals dissolve in water because

Which of the following pairs consists of only network solids?

What is lattice enthalpy? Give an example.

Intermolecular forces are forces of attraction and repulsion between interacting particles that will include :
$A$. dipole-dipole forces $B$. dipole-induced dipole forces $C$. hydrogen bonding $D$. covalent bonding $E$. dispersion forces
Choose the most appropriate answer from the options given below :

The ionic radii of $Rb^{+}$ and $I^{-}$ are $1.46 \ \mathring{A}$ and $2.16 \ \mathring{A}$,respectively. The most probable type of structure exhibited by it is:

Select the equation that represents an exothermic step.