$I_2$ molecules are held in the solid lattice by $...................$

Which substance has the highest melting point?

Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because

The solid phosphorus pentachloride exists as:

What are dipole-induced dipole forces? Give their characteristics.

The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules,respectively,is proportional to: [$r$ is the distance between the polar molecules]