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25 Questions

1. 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]
2. An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of the solution to increase? [2010]
3. The relative lowering of the vapour pressure is equal to the ratio between the number of [1991]
4. Which of the following aqueous solution has minimum freezing point? [1991]
5. 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]
6. Which one of the following salts will have the same value of van-™t Hoff factor as that of K4 [Fe (CN) 6]. [1994]
7. The number of moles of oxygen in one litre of air containing 21% oxygen by volume - in standard conditions - is [1995]
8. Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision? [2000]
9. A solution containing components Aand B follows Raoult's law when [2002]
10. Which of the following modes of expressing concentration is independent of temperature? [1992][1995]
11. Which one is a colligative property? [1992]
12. All form ideal solution except [1988]
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 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]
15. 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]
16. 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]
17. During osmosis - flow of water through a semipermeable membrane is [2006]
18. The mole fraction of the solute in one molal aqueous solution is: [2005]
19. 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]
20. At 25°C - the highest osmotic pressure is exhibited by 0.1 Msolution of [1994]
21. A 5% solution of cane sugar (mol. wt. =342) is isotonic with 1% solution of asubstance X. The molecular weight of X is [1998]
22. 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]
23. The van-™t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively: [2011]
24. 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]
25. 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]

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