Solutions
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Solutions
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25 Questions

1. 0.5 molal aqueous solution of aweak acid(HX) is 20% ionised. If Kf for water is 1.86 K kg mol-“ 1 - the lowering in freezing point of the solution is [2007]
2. The van-™t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively: [2011]
3. The beans are cooked earlier in pressure cooker - because [2001]
4. 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]
5. Asolution of sucrose (molar mass = 342 g mol-“1) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be (f for water = 1.86 Kkg mol-“1) . [2010]
6. All form ideal solution except [1988]
7. Camphor is often used in molecular mass determination because [2004]
8. The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of a nonvolatile soluteand 0.8 mol of solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature is [1996]
9. Which one is a colligative property? [1992]
10. 1.00 g of a non-electrolyte solute (molar mass 250 g mol-“1) was dissolved in 51.2 g of benzene. If the freezing point depression constant - Kf of benzene is 5.12 K kg mol-“1 - the freezing point of benzene will be lowered by [2006]
11. 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]
12. PAand PB are the vapour pressure of pure liquid components - A and B - respectively of an ideal binary solution. If XA represents the mole fraction of component A - the total pressure of the solution will be. [2012]
13. A solution containing 10 g per dm3 of urea(molecular mass = 60 g mol-“1) is isotonic with a solution of anon-volatile solute. The molecular mass of this nonvolatile solute is [2006]
14. 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]
15. The mole fraction of the solute in one molal aqueous solution is: [2005]
16. 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]
17. A solution of urea (mol. mass 56 g mol-1) boils at 100.18° C at the atmospheric pressure. If Kf and Ka for water are 1.86and 0.512 K kg mol-1 respectively - the above solution will freeze at [2005]
18. At 25°C - the highest osmotic pressure is exhibited by 0.1 Msolution of [1994]
19. During osmosis - flow of water through a semipermeable membrane is [2006]
20. 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]
21. An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase? [2010]
22. 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]
23. Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision? [2000]
24. Which one of the following salts will have the same value of van-™t Hoff factor as that of K4 [Fe (CN) 6]. [1994]
25. Which of the following aqueous solution has minimum freezing point? [1991]

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