The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is:

In ice,the $H - O - H$ bond angle is closest to which of the following?

Hydrogen bonding is not present in

Assertion : Water is liquid but $H_2S$ is a gas.
Reason : Oxygen is paramagnetic.

Intramolecular hydrogen bonding is formed in

Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces,greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line.
Water,hexane $(CH_3CH_2CH_2CH_2CH_2CH_3)$,glycerine $(CH_2OHCH(OH)CH_2OH)$