The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together

Answer Details

The vapour pressure of a liquid is the pressure exerted by the molecules of the liquid when they evaporate and become a gas. The higher the temperature, the more energy the liquid molecules have, which means they move faster and are more likely to escape into the gas phase. So, option l is correct, as the vapour pressure of a liquid depends on the temperature. Rate of condensation refers to the process by which gas molecules collide and stick together to form a liquid. However, this process does not affect the vapour pressure of the liquid, as it is only the reverse of the process of evaporation. Therefore, option ll is not correct. Cohesive forces are the forces that hold the particles of a liquid together. The stronger these forces, the harder it is for the molecules to escape into the gas phase, and thus the lower the vapour pressure of the liquid. So, option lll is correct, as the vapour pressure of a liquid depends on the cohesive forces holding the particles together. In conclusion, the correct option is l and lll only. The vapour pressure of a liquid depends on the temperature and the cohesive forces holding the particles together.