161.Benzoic acid completely demerises in benzene. What will be the vapour pressure of solution containing 61 g of benzoic acid per 500 g benzene when the vapour pressure of pure benzene at the temperature of experiment is 66.6 torr?
Which of the following solution has the lowest freezing point and why? 0.1m glucose.01 m KCl, 0.1 m Na2SO4.
0.1m Na2SO4 will have the lowest freezing point as it contains maximum number of ions in solution. The van’t Hoff factor is maximum. As i increase, Tf increase and freezing point of the solution decrease.
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163.Derive a relationship between mole fraction and vapour pressure of a compound of an ideal solution in the liquid phase and vapour phase.
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164.100 g of a 10% solution of NaOH contains 10 g of NaOH in ______g of water.
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165.3 g of a salt of molecular mass 30 is dissolved in 250 g water. The molality of the solution is __________.
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166.The sum of the mole fractions of solute and solvent is ________.
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167.Any solvent in the _______ state would behave ideally.
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168.When an azeotropic mixture is distilled, its volume remains ________.
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169.For a non ideal solution exhibiting negative deviations from Raoult’s law, ΔHmix has a________non-zero value.
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170.The limiting value of the Van’t Hoff factor for Na2SO4.10H2O is________.
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