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18. Which of the following can be measured by the ostwald-walker dynamic method

a. Vapour pressure of the solvent

b. Relative lowering of vapour pressure

c. Lowering of vapour pressure

d. All of these

Ans. b

Explanation : Ostwald-Walker dynamic method is used for measurement of relative lowering of vapour pressure.

PrevPrevious17. Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ration of 1:1 and a vapour pressure of 350 mm when mixed in the molar ration of 1 : 2 at the same temperature. The vapour pressure of the two pur liquids X and Y respectively are

Next20. At 300 K two pure liquids A and B have vapour pressure respectively 150 mm Hg. In an equimolar liquid mixture of A and B, the mole fraction of B in the vapour mixture at this temperature isNext

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