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(B) When a non-volatile solute like salt is added to water in a sealed vessel,the number of solvent molecules at the surface decreases,which reduces t

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Adding salt to water

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(B) When a non-volatile solute like salt is added to water in a sealed vessel,the number of solvent molecules at the surface decreases,which reduces the rate of evaporation. This leads to a decrease in the vapour pressure of the solution compared to pure water. This phenomenon is known as the lowering of vapour pressure,given by $\Delta p = p^{\circ} - p$,where $\Delta p \propto \chi_B$ ($p^{\circ}$ is the vapour pressure of pure water,$p$ is the vapour pressure of the solution,and $\chi_B$ is the mole fraction of the solute).

Which of the following changes decreases the vapour pressure of water kept in a sealed vessel?

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