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Solutions
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1. Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 25ºC are 200 mm Hgand 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl3and 40 g of CH2Cl2 at the same temperature will be: (Molecular mass of CHCl3 = 119.5 uand molecular mass of CH2Cl2 = 85 u) . [2012]
2. Camphor is often used in molecular mass determination because [2004]
3. A solution containing components Aand B follows Raoult's law when [2002]
4. Blood cells retain their normal shape in solution which are [1991]
5. An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase? [2010]
6. The freezing point depression constant for water is -“ 1.86ºCm-“1. If 5.00 g Na2 SO4 is dissolved in 45.0 g H2O - the freezing point is changed by -“ 3.82ºC. Calculate the van-™t Hoff factor for Na2 SO4. [2011]
7. The van-™t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively: [2011]
8. A solution of acetone in ethanol [2006]
9. A 0.0020 m aqueous solution of an ionic compound Co(NH3) 5 (NO2 ) Cl freezes at -“ 0.00732 °C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (Kf = -“ 1.86°C/m) [2009]
10. According to Raoult's law - relative lowering of vapour pressure for a solution is equal to [1995]
11. Which of the following modes of expressing concentration is independent of temperature? [1992][1995]
12. A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86°C/m - the freezing point of the solution will be [2011]
13. 200 mL of an aqueous solution of aprotein contains its 1.26 g. The osmotic pressure of this solution at 300 Kis found to be 2.57 × 10-“3 bar. The molar mass of protein will be (R= 0.083 Lbar mol-“1 K-“1) [2011]
14. The relative lowering of the vapour pressure is equal to the ratio between the number of [1991]
15. Vapour pressure of benzene at 30°C is 121.8 mm. When 15 g of anon volatile solute is dissolved in 250 g of benzene its vapour pressure decreased to 120.2 mm. The molecular weight of the solute (Mo. wt. of solvent = 78) [1995]
16. How many grams of concentrated nitric acid solution should be used to prepare 250 mLof 2.0M HNO3? The concentrated acid is 70% HNO3 [2013]
17. All form ideal solution except [1988]
18. The mole fraction of the solute in one molal aqueous solution is: [2005]
19. An ideal solution is formedwhen its components [1988]
20. During osmosis - flow of water through a semipermeable membrane is [2006]
21. Mole fraction of the solute in a 1.00 molal aqueous solution is: [2011]
22. The number of moles of oxygen in one litre of air containing 21% oxygen by volume - in standard conditions - is [1995]
23. 25.3 g of sodium carbonate - Na2 CO3 is dissolved in enough water to make 250 mLof solution. If sodium carbonate dissociates completely - molar concentration of sodium ions - Na+and carbonate ions - CO32- are respectively(Molar mass of Na2CO3 = 106 g mol-“1) [2010]
24. The vapour pressure of a solvent decreased by 10mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20mm of mercury? [1998]
25. At 25°C - the highest osmotic pressure is exhibited by 0.1 Msolution of [1994]

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