Question

Two beakers of capacity $500mL$ were taken. One of these beakers, labelled as "$A$", was filled with $400mL$ water whereas the beaker labelled "$B$" was filled with $400mL$ of $2M$ solution of $NaCl$. At the same temperature both the beakers were placed in closed containers of same material and same capacity as shown in figure.

At a given temperature, which of the following statements is correct about the vapour pressure of pure water and that of $NaCl$ solution.

• A. Vapour pressure in container $(A)$ is more than that in container $(B)$
• B. Vapour pressure in container $(A)$ is less than that in container $(B)$
• C. Vapour pressure is equal in both the containers
• D. Vapour pressure in container $(B)$ is twice the vapour pressure in container $(A)$

Answer 1

Answer: (A)

When a non-volalite solute $(NaCl)$ is dissolved in a liquid, its vapour pressure decreases.