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  • Two beakers of capacity 500 mL were taken. One of these beakers, labeled as “A”, was filled with 400 mL water whereas the beaker labelled “B” was filled with 400 mL of 2 M solution of NaCl.

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

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

(i) the vapour pressure in container (A) is more than that in a container (B).

(ii) the vapour pressure in container (A) is less than that in the container (B).

(iii) vapour pressure is equal in both containers.

(iv) the vapour pressure in container (B) is twice the vapour pressure in container (A).

Answers (1)

The answer is the option (i). Vapour pressure of container (B) is lower as NaCl being a non-volatile solute reduces the vapour pressure.

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid.

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