Assertion (A): The vapour pressure of a liquid increases with an increase in temperature.
Reasoning (R): An increase in temperature increases the kinetic energy of the molecules, leading to an increase in the number of molecules that escape from the liquid surface.
Both Assertion and Reasoning are true, and Reasoning is the correct explanation of Assertion.
Both Assertion and Reasoning are true, but Reasoning is not the correct explanation of Assertion.
Assertion is true, but Reasoning is false.
Both Assertion and Reasoning are false.
The vapour pressure of a liquid is the pressure exerted by its vapour in equilibrium with the liquid at a given temperature. An increase in temperature increases the kinetic energy of the molecules, leading to an increase in the number of molecules that escape from the liquid surface. This, in turn, increases the number of molecules in the vapour phase and hence the vapour pressure. Therefore, Assertion (A) is correct. Reasoning (R) is also correct, as it explains why Assertion is true. Hence, Option (a) is the correct answer.