A) elementary gases only
B) mixture of gases
C) inert gases only
D) rare gases only
Correct Answer: B
Solution :
van der Waals forces may be defined as ?The very short lived intermolecular attractive forces which exist between all kinds of atoms, molecules and ions when they are sufficiently close to each other.? The forces of attraction exists between uncharged atoms, or molecules in solid, liquid and gaseous states, van der Waals forces are applied to mixture of gases. The magnitude of these forces decreases from solid to gas. These forces are much weaker than both ionic and covalent bonds. These forces varies from 2-20 kJ \[mo{{l}^{-1}}\]. These forces are present even in case of non-polar molecules such as \[{{H}_{2}},{{O}_{2}},C{{l}_{2}},C{{H}_{4}}\], etc, in the solid and liquid state.
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