Solutions
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Solutions
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25 Questions

1. Which of the following 0.10 m aqueous solutions will have the lowest freezing point? [1997]
2. According to Raoult's law - relative lowering of vapour pressure for a solution is equal to [1995]
3. 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]
4. During osmosis - flow of water through a semipermeable membrane is [2006]
5. 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]
6. A 5% solution of cane sugar (mol. wt. =342) is isotonic with 1% solution of asubstance X. The molecular weight of X is [1998]
7. Which of the following modes of expressing concentration is independent of temperature? [1992][1995]
8. Mole fraction of the solute in a 1.00 molal aqueous solution is: [2011]
9. 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]
10. The van-™t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively: [2011]
11. 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]
12. The relative lowering of the vapour pressure is equal to the ratio between the number of [1991]
13. 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]
14. If 0.1 Msolution of glucose and 0.1 Msolution of urea are placed on two sides of the semipermeable membrane to equal heights - then it will be correct to say that [1992]
15. Which one is a colligative property? [1992]
16. An ideal solution is formedwhen its components [1988]
17. A solution of acetone in ethanol [2006]
18. 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]
19. All form ideal solution except [1988]
20. Blood cells retain their normal shape in solution which are [1991]
21. 1 M - 2.5 litre NaOHsolution is mixed with another 0.5 M - 3 litre NaOH solution. Then find out the molarity of resultant solution [2002]
22. The mole fraction of the solute in one molal aqueous solution is: [2005]
23. Camphor is often used in molecular mass determination because [2004]
24. 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]
25. 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]

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