Untitled Document

Question Bank No: 1

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

a)		1 g
b)		3 g
c)		6 g
d)		8 g

2. Concentrated aqueous sulphuric acid is 98% $H_{2} S O_{4}$ by mass and has a density of 1.80 g m $L^{- 1} .$ Volume of the acid required to make one litre of 0.1 M $H_{2} S O_{4}$ solution is

a)		5.55mL
b)		11.10 mL
c)		16.65 mL
d)		22.20 mL

3. pH of 0.1 M monobasic acid is found to be 2. Hence its osmotic pressure at a given temperature 'T' K is

a)		0.1 RT
b)		0.11 RT
c)		1.1 RT
d)		0.01 RT

4. Which of the following solutions has highest normality?

a)		8g KOH per litre
b)		normal phosphoric acid
c)		6 g of NaOH per 100ml
d)		0.5 M $H_{2} S O_{4}$

5. 3% aqueous solution of dextrose (mol. mass=180) is isitonic with 2% aqueous solution of another non-electrolyte solute at $25^{0} C .$ The molecular mass of the solute is

a)		60
b)		120
c)		180
d)		90

6. Osmotic pressure of 30% solution of glucose is 1.20 bar and that of 3.42% solution of case sugar is 2.5 bar. The osmotic pressure of the mixture containing equal volumes of the two solutions will be

a)		2.5 bar
b)		3.7 bar
c)		1.85 bar
d)		1.3 bar

7. A solution of benzoic acid dissolved in benzene will show a molecular mass closer to

a)		122
b)		244
c)		61
d)		366

8. The ratio of the value of any colligative property for Ba(N $O_{3})_{2} (aq)$ to that of sugar solution is approximately

a)		1:1
b)		0.5:1
c)		5:2
d)		3:1

9. A substance shows the phenomenon of deliquescene if its vapour pressure is

a)		equal to the atmospheric pressure
b)		less than the atmospheric pressure
c)		greater than that of water vapour in air
d)		less than of water vapour in air

10. Benzene ( $p^{0} = 160 mm)$ and toluene ( $p^{0} = 68 mm)$ form ideal solution at certain temperature with mole fraction of benzene as 0.2. The vapour pressure os solution will be

a)		220 mm
b)		86.4 mm
c)		160 mm
d)		cannot be predicted

11. A sample of sea water was found to contain 4.9 $\times 10^{- 3} g$ os dissolved oxygen per kilogram. The concentration of oxygen in parts per million is

a)		49
b)		4.9
c)		0.49
d)		2.45

12. 0.5M aqueous solution of glucose is isotomic with

a)		0.5 M KCL solution
b)		0.5 M CaC $L_{2}$ solution
c)		0.5 M urea solution
d)		1 M solution of surcose

13. 4L of 0.2M aqueous solution of KOH is mixed with 2L of 0.5 M aqueous solution of KOH. The molarity of the resulting solution is

a)		0.7M
b)		0.3M
c)		0.2M
d)		1.8M

14. Certain substance trimerises when dissolved in a solvent A. The van't Hoff'sfactor 't' for the solutions is

a)		1
b)		$\frac{1}{3}$
c)		3
d)		unpredictable

15. "The solubility of gas in a liquid is directly proportional to the pressure of the gas above the liquid. The statement is based upon

a)		Kohrausch's law
b)		Raoult's law
c)		Henry's law
d)		Ostwald's law

16. The number of moles of sodium hydroxide present in 2.5L of 0.5 M aqueous solution is

a)		1.25
b)		0.5
c)		12.5
d)		5

17. The density of 5 molal solution of urea is 1.3g c $m^{- 3} .$ Concentration of this solution in terms of molarity would be

a)		5M
b)		$> 5 M$
c)		$< 5 M$
d)		cannot be predicted

18. Which of the following concentration factor is affected by change in temperature?

a)		molarity
b)		molality
c)		mol fraction
d)		weight fraction

19. The molarity of a solution of N $a_{2} C O_{3}$ having 10.6 g/500 ml of solution is

a)		0.2 M
b)		2 M
c)		20 M
d)		0.02 M

20. The elevation in the boiling point would be highest for

a)		0.08 M barium chloride solution
b)		0.10 M glucose solution
c)		0.15 M potassium chloride solution
d)		0.06 M calcium nitrate solution

21. If each of the following salts dissociates in aqueous solution to the extent of 90% then the one with highest osmotic pressure would be

a)		decimolar solution of ${Al}_{2} ({SO}_{4}) 3$
b)		decimolar solution of ${NA}_{2} {SO}_{4}$
c)		decimolar solution of ${BaCl}_{2}$
d)		decimolar solution of $NaCl$

22. For a solution of acetone in ${CS}_{2}$ the value of ${Δ S}_{mix}$ is

a)		>0
b)		<0
c)		=1
d)		=0

23. The freezing point of a solution prepared from 1.25 g of non electrolyte and 20g of water is 271.9K.If molal depression constant is 1.86 K ${mol}^{- 1}$ then molar mass of the solute will be

a)		105.7
b)		106.7
c)		115.3
d)		93.9

24. What will be the molality of a solution having 18 g of glucose (M. mass 180) dissolved in 500g of water?

a)		1m
b)		0.5m
c)		0.2m
d)		2m

25. Molal depression constant for water is 1. $86^{0} C .$ The freezing point of a 0.05 molal solution of a non-electrolyte in water is

a)		-1. $86^{0} C .$
b)		-0. $93^{0} C .$
c)		-0. $093^{0} C .$
d)		0. $93^{0} C .$

26. The molarity of the solution containing 7.1 g of N $a_{2} {SO}_{4}$ in 100ml of aqueous solution is

a)		2M
b)		0.5M
c)		1M
d)		0.05M

27. Equal volume of 0.1 MAgN $O_{3}$ and 0.2 MNaCl are mixed.The concentration of ${NO}_{3}$ ions in the mixture will be

a)		0.1M
b)		0.05M
c)		0.2M
d)		0.15M

28. Osmotic pressure of a solution can be increased by

a)		decreasing the temperature
b)		increasing the volume
c)		increasing the number of molecules of the solute
d)		None of the above

29. An aqueous solution of glucose is 10% in strength.The volume in which 1gm mole of it is dissolved will be

a)		18L
b)		9L
c)		0.9L
d)		1.8L

30. For which of the following solutes'i' is greater than 1?

a)		Urea
b)		Sucrose
c)		Sodium chloride
d)		glucose

31. Osmotic pressure of a solution of electrolyte does not depend on
1. Nature of solute
11. Nature of solvent
111. Temperature
1V. Molar conc of solute

a)		1
b)		1,11
c)		11,111
d)		111,1V

32. 3% solution of glucose is isotonic with 1% .Solution of a non-volatile non-electrolyte substance.The molecular mass of the substance would be

a)		180
b)		360
c)		420
d)		60

33. At 300 K, the two solutions of glucose A and Bwith respective concentration 0.01 Mand 0.001 M are separated by semipermeable membrane. How much external pressure need to be applied and on which solution so as to prevent osmosis?

a)		0.2463 atm pressure is applied on solution B
b)		0.2217 atm pressure is applied on solution A
c)		0.0246 atm pressure is applied on solution B
d)		0.0217 atm pressure is applied on solution A

34. The vapour pressure of the solvent decreased by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of solute in solution is 0.2. What would be the mole fraction of solvent if decrease in vapour pressure is 20 mm of Hg ?

a)		0.8
b)		0.6
c)		0.4
d)		0.2

35. An ideal solution was obtained by mixing methanol and ethanol. If the partial vapour pressure of methanol and ethanol are 2.619 kPa and 4.556 kPa respectively, the composition of vapour( in terms of mole fraction) will be

a)		0.635 MeOH, 0.365 EtOH
b)		0.365 MeOH, 0.635 EtOH
c)		0.574 MeOH, 0.326 EtOH
d)		0.173 MeOH, 0.327 EtOH

36. Which of the following 0.10 m aqueous solutions will have lowest freezing point?

a)		KCl
b)		A $l_{2} (S O_{4})_{3}$
c)		$C_{6} H_{12} O_{6}$
d)		$C_{12} H_{22} O_{11}$

37. Which of the following has lowest freezing point?

a)		1% glucose
b)		1% sucrose
c)		1% KCl
d)		1% BaC $l_{2}$

38. Lowering in vapour pressure is the highest for

a)		0.2 M urea
b)		0.1 Mglucose
c)		0.1 M $M_{g} {SO}_{4}$
d)		0.1 M BaC $l_{2}$

39. The vapour pressure at a given temperature of an ideal solution containing 0.2 mol of a non-volatile solute and 0.8 mol of solvent is 60 mm og Hg. The vapour pressure of the pure solvent at the same temperature will be

a)		120 mm of Hg
b)		150 mm of Hg
c)		60 mm of Hg
d)		75 mm of Hg

40. What is the molarity of $H_{2} S O_{4}$ solution that has a density of 1.84 gm/cc at 3 $5^{\circ} C$ and contains 98% by mass ?

a)		4.18 M
b)		8.14 M
c)		18.4 M
d)		18.M

41. 12g of urea is dissolved in 1 litre of water and 68.4g of sucrose is dissolved in 1 litre of water. The lowering of vapours pressure of first solution is

a)		equal to that of second
b)		greater than the second
c)		less than the second
d)		double of the second

42. The normal boiling point of water is 373 K (at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vaporisation is 40.656 kJ mo $l^{- 1},$ the boiling point of water at 23mm pressure will be

a)		250K
b)		295K
c)		51.6K
d)		12.5K

43. The volume of 0.1M $H_{2} S O_{4}$ required to neutralise completely 40 mL of 0.2 MNaOH solution is

a)		10 mL
b)		40 mL
c)		20 mL
d)		80 mL

44. The osmotic pressure of 5%(mass volume) solution of cane sugar at 15 $0^{\circ} C$ (mol .mass sugar = 342) is

a)		4 atm
b)		5.07 atm
c)		3.55 atm
d)		2.45 atm

45. An aqueous solution containing 1g of urea boils at 100.2 $5^{\circ} C .$ The aqueous solution containing 3g of glucose in the same volume will boil at

a)		100.7 $5^{\circ} C .$
b)		100. $5^{\circ} C .$
c)		10 $0^{\circ} C .$
d)		100.2 $5^{\circ} C .$

46. AcOH dimerises in its solution in benzene. Experimental measurement of molecular mass using cryoscopic technique resulted in van't Hoffs factor to be 0.52. the degree of association of AcOH is

a)		0.48
b)		0.96
c)		0.88
d)		0.52

47. The mass of pure NaOH required to prepare 250 c $m^{3} of 0.1$ Nsolution is

a)		4g
b)		1g
c)		2g
d)		10g

48. The ebullioscopic constant for water is 0.51 $3^{\circ} Ckg mo l^{- 1} .$ The aqueous solution of sugar containing 0.1 mole of it in 200 g of water will boil under a pressure of one atm at

a)		100.51 $3^{\circ} C$
b)		100.051 $3^{\circ}$ C
c)		100.25 $6^{\circ} C$
d)		101.02 $5^{\circ}$ C

49. For a solution containing non-volatile solute, the relative lowering of vapour pressure is 0.2. If the solution contains 5 moles in all, which of the following are true ?
1. Mole fraction of solute in the solution is 0.2
11. No. of moles of solute in the solution is 0.2
111.No. of moles of solvent in the solution is 4
1V.Mole fraction of solvent is 0.2.

a)		1,1V
b)		11,111
c)		1,111
d)		11 ,1V

50. Which of the following statementd are not true?
1. Normality of a solution is always greater than molarity
11.Normality of a solution increases with increase in temperature
111.Normality of a solution may be equal to or greater than the molarity
1V. Normality $\times$ Eq .mass = Molarity $\times$ Mol mass

a)		1,11
b)		11,111
c)		111,1V
d)		1V,1