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Raoult's Law

Two beakers o...

Question

Two beakers of capacity $500 m L$ were taken. One of these beakers, labelled as "A", was filled with $400 m L$ water whereas the beaker labelled "B" was filled with $400 m L$ of $2 M$ solution of $N a C l$ . At the same temperature, both the beakers were placed in closed containers of the same material and same capacity as shown in the figure.
At a given temperature, which of the following statements is correct about the vapour pressure of pure water and that of $N a C l$ solution?

Vapour pressure in container (A) is more than that in container (B)

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Vapour pressure in container (A) is less than that in container (B)

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Vapour pressure is equal to both the containers

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Vapour pressure in container (B) is twice the vapour pressure in container (A)

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Solution

The correct option is B Vapour pressure in container (A) is more than that in container (B)
When salt is added to water for making the solution, the vapour pressure of solution gets decreases. This is because due to a decrease in the surface covered by the solvent molecule which leads to a decrease in the number of solvent molecule escaping from the surface corresponding to pure solvent.
It must be noted that NaCl is a non-volatile solute and it will reduce the vapour pressure of the solution. So, the vapour pressure of pure water in container A is more than in container B. Hence, vapour pressure also get reduces.
So, the correct option is A.

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Similar questions

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 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 sttement is correct about the vapour pressure of pure water and that of $N a C^{1}$ 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)

Q. Two container A and B are partly filled with water and closed. The volume of A is twice that of B and it contains half the amount of water in B. If both are at same temperature, the water vapour in the container will have pressure in the ratio of?

Q. Three beakers labelled as

A, B

and

C

each containing 25 mL of water were taken. A small amount of

N a O H

, anhydrous

C u S O_{4}

and

N a C l

were added to the beakers

A, B

and

C

respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers

A

and

B

, whereas in case of beaker

C

, the temperature of the solution falls. Which one of the following statement(s) is(are) correct ?
(i) In beakers

A

and

B

, exothermic process has occurred.
(ii) In beakers

A

and

B

, endothermic process has occurred.
(iii) In beaker

C

exothermic process has occurred.
(iv) In beaker

C

endothermic process has occurred.

Q. Question 5

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of

NaOH

, anhydrous

{CuSO}_{4}

and

NaCl

were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is/are correct?

(i) In beakers A and B, an exothermic process has occurred.
(ii) In beakers A and B, an endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.

(a) (i) only
(b) (ii) only
(c) (i) and (iv)
(d) (ii) and (iii)

Q. The closed containers of the same capacity and at the same temperature are filled with

44 g

H_{2}

in one and

44 g

{C O}_{2}

in the other. If the pressure of carbon of carbon dioxide in the second container is 1 atm. That of hydrogen in the first container would be:

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