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Solutions
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25 Questions

1. 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]
2. 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]
3. The vapour pressure of two liquids -˜P-™ and -˜Q-™ are 80 and 60 torr - respectively. The total vapour pressure of solution obtained by mixing 3 mole of Pand 2 mole of Qwould be [2005]
4. The mole fraction of the solute in one molal aqueous solution is: [2005]
5. 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]
6. Mole fraction of the solute in a 1.00 molal aqueous solution is: [2011]
7. A solution containing components Aand B follows Raoult's law when [2002]
8. A 5% solution of cane sugar (mol. wt. =342) is isotonic with 1% solution of asubstance X. The molecular weight of X is [1998]
9. 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]
10. 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]
11. 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]
12. Molarity of liquidHCl will be - if density of solution is 1.17 gm/c [2001]
13. Which of the following 0.10 m aqueous solutions will have the lowest freezing point? [1997]
14. Which one is a colligative property? [1992]
15. The van-™t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively: [2011]
16. Which of the following aqueous solution has minimum freezing point? [1991]
17. The number of moles of oxygen in one litre of air containing 21% oxygen by volume - in standard conditions - is [1995]
18. 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]
19. 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]
20. 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]
21. According to Raoult's law - relative lowering of vapour pressure for a solution is equal to [1995]
22. 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]
23. 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]
24. Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision? [2000]
25. All form ideal solution except [1988]

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