How are mixtures different than pure substances?

Question 5 options:

Mixtures contain only one type of atom.

Mixtures can be separated physically.

Mixtures are less dense than pure substances.

Mixtures have lower boiling points.

What kind of intermolecular forces act between a hydrogen fluoride molecule and a hydrogen peroxide molecule? note: if there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.