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Colligative Properties

Which of the ...

Question

Which of the following can be measured by the Ostwald-Walker dynamic method?

A

Relative lowering of vapour pressure

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B

Lowering of vapour pressure

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C

Vapour pressure of the solvent

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D

All of these

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Solution

The correct option is A Relative lowering of vapour pressure
Ostwald and Walker's method is used to measure the relative lowering in vapour pressure of the solution.
Hence, option A is correct.

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Q. Correct combination among the following is
i) Water can be converted into vapour at

100^{0} C

only
ii) Vapour pressure can be increased more than the atmospheric pressure at a certain temperature.
iii) Lowering of vapour pressure is directly proportional to mole fraction of solute.

Q. In Ostwald-Walker method, dry air is passed through a solution beaker, then a pure solvent beaker and then, through the dehydrating agent. Which of the following statement is correct regarding the above setup?
Here,

p^{\circ} is the vapour pressure of the pure solvent

p_{s} is the vapour pressure of the solution

Q. Which expression of relative lowering of vapour pressure is correct:
delta P/initial vapour pressure of the solvent(P^0)
OR
DeltaP/vapour pressure of solution(Ps)

Q. In Ostwald-Walker method, dry air is passed through a series of beaker containing solution and solvent and finally through a dehydrating agent as shown in the figure

Which of the following is incorrect regarding the above setup?
Here,

p^{\circ} is the vapour pressure of the pure solvent

p_{s} is the vapour pressure of the solution

Q. The highest temperature at which vapour pressure of a liquid can be measured is:

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