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प्रश्न
Two beakers of capacity 500 mL were taken. One of these beakers, labelled 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 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.
विकल्प
Vapour pressure in container (A) is more than that in container (B).
Vapour pressure in container (A) is less than that in container (B).
Vapour pressure is equal in both the containers.
Vapour pressure in container (B) is twice the vapour pressure in container (A).
उत्तर
Vapour pressure in container (A) is more than that in container (B).
Explanation:
Since NaCl is a non-volatile solute, it will reduce vapour pressure of the solution. Hence, vapour pressure of pure water in container A is more than in container B.
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