In which types of substances are intermolecular (van der Waals) forces present?

The hydration energies of $K^{+}$ and $Cl^{-}$ are $-x$ and $-y$ $kJ / mol$ respectively. If the lattice energy of $KCl$ is $-z$ $kJ / mol$,then the heat of solution of $KCl$ is $:$

Particles of quartz are packed by

Which of the following structural features of graphite best accounts for its use as a lubricant?

Which of the following characteristics is incorrectly matched?

Write a note on Dipole-Induced Dipole forces.