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Question

If F represents the strength of cohesive force, then what will be the correct order for strength of cohesive force for solid, liquid and gas ?
  1. Fsolid<Fliquid<Fgas
  2. Fsolid>Fliquid>Fgas
  3. Fsolid<Fliquid=Fgas
  4. Fliquid>Fgas>Fsolid


Solution

The correct option is B Fsolid>Fliquid>Fgas
Cohesive forces are weak intermolecular forces and operate within a short range only, hence the strength of cohesive force weakens if the distance between molecules increases.
Distance (r) between molecules in gases, liquids and solid is in the order,
rgas>rliquid>rsolid
Order of strength of cohesive force for solid, liquid and gases are
Fsolid>Fliquid>Fgas

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