10. Noble gas molecules are held together by A Van der waals forcesB Hydrogen bondsC Dative bondsD Covalent bonds

Noble gas molecules are held together by Van der Waals forces. So, the correct answer is A. Van der Waals forces.

Here's why:

Noble gases are monoatomic, meaning they exist as individual atoms rather than as molecules. They are stable and have a full valence electron shell, so they don't form covalent bonds (option D) with other atoms.

They also don't form hydrogen bonds (option B) because they don't contain hydrogen.

Dative bonds (option C) are a type of covalent bond where both electrons come from the same atom. This doesn't apply to noble gases because they don't form covalent bonds.

Van der Waals forces (option A) are weak, short-range attractive forces between uncharged molecules, arising from the interaction of permanent or transient electric dipole moments. These are the forces that hold noble gas atoms together.