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Chemistry

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53. Which values can be obtained from the information represented by the vapour pressure curve of a liquid

A. Normal boiling point B. Normal freezing point C.  Enthalpy of vaporization a. A  only b. A and B only...

49. Normal boiling point of water is 373 . Vapour pressure of water at 298 K is 23 mm. if the enthalpy of evaporation is 40.656

κ J/mole, the boiling point of water at 23 mm pressure will be a. 250 K b. 294 K c....

52. When a liquid that is immiscible with was steam distilled at

95. 2 ° C at a total pressure of 99.652 KPa. The distillate contained 1.27 g of the liquid per...

51. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to…..

a.  Low temperature b. Low atmospheric pressure c. High atmospheric pressure d. Both low temperature and high atomospheric pressure Ans....

50. Pick out the wrong statement (s)

1.. Vapour pressure of a liquid is the measure of the strengh of intermolecular attttactive forces 2. Surface tension of...

48. At

100° C the vapour pressure of a solution of 6.5g of a solute in 100 g water is 732mm. If...

44. The mass of glucose that should be dissolved in 50 gof water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 gof urea in the same quantity of water is

a. 1 g b. 3g c. 6 g d. 18 g Ans. b (40)

41. Which has miximum vapour pressure

a. HI b. HBr c. HCl d. HF Ans. c (12)

40. An ideal solution was obtained by mixing methanol and ethanol. if the partial vapour pressure of methanol and ethanol are 2.619

κPa and 4.556 κPa respectively, the composition of the vapour wll be a. 0.635 methanol, 0.365 ethanol b. 0.365 methanol,...

39. 18g of glucose is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at

100°  C is a. 759.00 Torr b. 7. 60 Torr c. 76.00 Torr d. 752.40 Torr Ans. d (17)

38. Which of the following is incorrect

a. Relative lowering of vapour pressure is independent b. The vapour pressure is a colligative property c. Vapour pressure of...

35. 5

cm3  of acetone is added to 100 cm3  of water, the vapour pressure of water over the solution a. it...

34. The relative lowering of the vapour pressure is equal to the ration between the number of

a. Solute molecules and solvent molecules b. Solute molecules and the total molecules in the solution c. Solvent molecules and...

32. An aqueous solution of methanol in water has vapour pressure

a. Equal to that of water b. Equal to that of methanol c. More than that of water d. Less...

27. Vapour pressure of a solution of 5g of non – electrolyte in 100 g of water at a particular temperature is

2985 N / m2 . The vapour pressure of pure water is 3000 N/ m2 . The molecular weight of...

47. Which of the following statement about the composition of the vapour of over an ideal 1:1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at

25 ° C .(Given : Vapour pressure Date at 25 ° C   benzene = 12.8 κPa, Toluene = 3.85 κPa )...

46. For a dilute solution containing 2.5 g of a non volatile non electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is

2  ° C . Assuming concentration of solute is much lower than the concentration of solution is a. 724 b. 740...

45. Vapour pressure increases with increase in

a. Concentration of solution containing non-volatile solute b. Temperature upto boiling point c. Temperature upto triple point d. Altitude of...

43. If two substance A and B have

PA o  : PB o  = 1 : 2  and have mole fraction in solution 1: 2 then mole fraction of A...

42. At

80° C the vapour pressure of pure liquid ‘A’ is 520 mmHg and that of pure liquid ‘B’ is 1000...

37. The vapour pressure lowering caused by the addition of 100 g of sucrose to 100 gof water if the vapour pressure of pure water at

25 C is 23. 8 mm Hg a. 1.25 mm Hg b. 0.125 mm Hg c. 1.15 mm Hg d....

36. A solution has a 1 : 4 mole ration of pentane to hexane. The vapour pressure of the pure hydrocarbons at

20° C are 440 mmHg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour...

33. Which solution will show the maximum vapour pressure at 300 K

a. 1 M C12 H22 O11 b. 1 M CH3 COOH c. 1 M CaCl 2 d. 1 M NaCl Ans....

31. Two beaker of capacity 500 mL were taken. One of these beaker, labelled as “A” was filled with 400 mL water whereas the beaker labelled “B” was filled with 400 mL of 2 M solution of NaCl. At the same temperature both the beakers were placed inn closed containers of same material and same capacity as shown in figure

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that...

30. The boiling point of a solution of 0.11 g of a substance in 15g of ether was found to be

0.1 °C  higher than that of the pure ether. The molecular weight of the substance will be be a. 148...

29. Equal weight of

CH4  and H2  are mixed in an empty container at 25° C. The fraction of the total pressure exerted by ...

28. A solution is obtained by dissolving 12 g of urea in a litre of water. Another solutiono is obtained by dissolving 68.4 g of cane- suger in a litre of water at the same temperature. The lowering of vapour pressure in the first solution is

a. Same as that of 2nd   solution b. Nearly one fifth of the  2nd solution c. Double that of 2nd ...

26. For a non volatile solute

a. Vapour pressure of solute is zero b. Vapour pressure of solvent is zero c. Vapour pressure of solution is...

25. If

Po and P are the vapour pressure of the pure solvent and solution and n1  and n2 are the moles...

24. The vapour pressure of acetone at

20° C is 185 torr. When 1.2 g of a non volatile substance was dissolved in 100 g of acetone...

23. The mass of a non volatile solute of molar mass 40 g

mol-1  that should be dissolved in 114 g of octane to lower its vapour pressure by 20  % is a....

22.

PA   and PB  are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution....

8. According to Raoult’s law the relative lowering of vapour pressure of a solution of non-volatile substance is equal to

a. Mole fraction of the solvent b. Mole fraction of the solute c. Weight percentage of a solute d Weight...

19. Vapour pressure of pure ‘A’ is 70 mm of Hg at

25° C. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour...

11. 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 P and 2 mole of Q would be

a. 140 torr b. 20 torr c. 68 torr d. 72 torr Ans. d (60)

4. The vapour pressure of water at

20° C is 17.5 mmHg. if 18 g of glucose is added to 178.2 g of water at 20° C...

9. Which colligative property is more useful to determine the molecular weight of the substance like proteins and polymers

a. Lowering of vapour pressure b.Elevation in boiling point c. Depression of freezing point d. Osmotic pressure Ans. d (4)

7. Which has highest freezing point

a. 1 m K [ Fe (CN)6 ]  solution b. 1 m C6 H12 O6 solution c. 1 m KCl solution...

6. The magnitude of colligative properties in all colloidal dispersions is….than solution

a. Lower b. Higher c. Both d.None Ans. a   (6)

7. Benzene and toluene form nearly ideal solutions. At

20° C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour...

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