Explanation:

When the pressure on the surface of a gas is increased, the inter-particle forces between the gas molecules will increase.

Inter-particle forces in gases:
In a gas, the inter-particle forces are very weak compared to solids and liquids. Gas molecules are in constant random motion and are far apart from each other. The inter-particle forces in gases are mainly due to weak van der Waals forces, which arise from temporary fluctuations in electron distribution around the molecules. These forces are relatively weak and decrease rapidly with distance.

Effect of increased pressure:
When the pressure on the surface of a gas is increased, it means that more force is applied to the gas molecules. This increased force causes the gas molecules to come closer together, thereby increasing the density of the gas.

Increased inter-particle forces:
As the gas molecules come closer together, the distance between them decreases. This results in an increase in the strength of the inter-particle forces. The weak van der Waals forces become stronger as the molecules are brought closer, causing an increase in the inter-particle forces.

Consequences of increased inter-particle forces:
The increase in inter-particle forces leads to several consequences:
1. Increased attraction: The gas molecules experience stronger attractions between each other, which can affect their behavior and properties.
2. Reduced kinetic energy: The increased inter-particle forces can reduce the kinetic energy of the gas molecules, causing them to move at slower speeds.
3. Lower temperature: The reduction in kinetic energy can result in a decrease in temperature, as temperature is related to the average kinetic energy of the gas molecules.

Conclusion:
When the pressure on the surface of a gas is increased, the inter-particle forces between the gas molecules will increase. This occurs due to the closer proximity of the gas molecules as a result of increased pressure.