NEET > Chemistry Class 12 > Vapour Pressure of Liquid Solutions
Vapour Pressure of Liquid Solutions Video Lecture - Chemistry Class 12 - NEET
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FAQs on Vapour Pressure of Liquid Solutions Video Lecture - Chemistry Class 12 - NEET
| 1. What is vapour pressure of a liquid? |  |
Ans. Vapour pressure of a liquid refers to the pressure exerted by its vapor when the liquid is in equilibrium with its vapor phase at a given temperature. It is a measure of the tendency of the liquid molecules to escape into the gas phase.
| 2. How does the vapour pressure of a liquid solution differ from that of a pure liquid? | |
Ans. The vapour pressure of a liquid solution is lower than that of a pure liquid at the same temperature. This is because the presence of solute molecules in the solution reduces the number of solvent molecules available to escape into the vapor phase, resulting in a decrease in vapour pressure.
| 3. What factors affect the vapour pressure of a liquid solution? | |
Ans. The vapour pressure of a liquid solution is influenced by the temperature, the nature and concentration of solute molecules, and the intermolecular forces between the solvent and solute. Higher temperature and lower concentration of solute molecules lead to higher vapour pressure, while stronger intermolecular forces decrease the vapour pressure.
| 4. How is the vapour pressure of a liquid solution related to its boiling point? | |
Ans. The vapour pressure of a liquid solution is directly related to its boiling point. As the vapour pressure increases, the boiling point decreases. This is because a higher vapour pressure indicates that more molecules of the liquid have enough energy to overcome the atmospheric pressure and enter the vapor phase.
| 5. How can the vapour pressure of a liquid solution be determined experimentally? | |
Ans. The vapour pressure of a liquid solution can be determined using various techniques, such as the Knudsen effusion method or the use of vapor-pressure osmometry. These methods involve measuring the pressure of the vapor phase above the liquid solution at different temperatures and using the collected data to calculate the vapour pressure.
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