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Q.

Two beakers of capacity 500 mL were taken. One of these beakers, labelled as A, was filled with 400 mL water, whereas the other beaker is labelled as '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 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?

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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 contain er A

answer is A.

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Detailed Solution

When salt is added to water to make the solution, the vapour pressure of solution decreases. This is due to decrease in surface covered by solvent molecules which lead to decrease in number of solvent molecules escaping from the surface corresponding to pure solvent. Hence, vapour pressure also gets reduced.

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Two beakers of capacity 500 mL were taken. One of these beakers, labelled as A, was filled with 400 mL water, whereas the other beaker is labelled as '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 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?