SOLUTIONS – 5

1) The conjugate base of a strong acid is a base which is
a) feeble
b) weak
c) strong
d) weak or strong depending upon the strength of acid

2) The ion Na+, K +, Mg2+ etc are easily extracted into water. Such ions have their charge/size ratio
a) <4
b) >4
c) <1
d) >12

3) The ionic product of water at 00C is
a) 1.1 * 10 13
b) 1 * 10 14
c) 5.47 * 10 14
d) 1.1 * 10 -14

4) As a result of osmosis, the volume of the solution,separated from the solvent by a semipermeable membrane
a) gradually decreases
b) gradually increases
c) is not affected
d) any of the three

5) The relationship between osmotic pressure at 273 K when 10 g glucose 10 g urea , and 10 g sucrose are dissolved in 250 ml of water is
a)
b)
c)
d)

6) If the solution boils at a temperature and the solvent at a temperature the elevation of boiling point is given by
a)
b)
c)
d)

7) The molecular weight of benzoic acid in benzene as determined by the depression in freezing point method corresponds to the
a) ionization of benzoic acid
b) dimerization of benzoic acid
c) trimerization of benzoic acid
d) solvation of benzoic acid

8) 0.1 M NaCl and 0.1 M are kept in separate containers. If their osmotic pressures are respectively then what is the correct statement?
a)
b)
c)
d)

9) What happen when isotonic solutions of A (mol. wt. 342) and B (mol. wt. 60) are put into communication through a semipermeable membrane?
a) Transference of solvent from solution of A to that of B takes place
b) Transference of solvent from solution of B to that of A takes place
c) No transference of solvent from solution of A to that of B takes place
d) A change in the temperature of the solutions takes place

10) If all the following four compounds were sold at the same price, which would be cheapest for preparing an antifreeze solution for a car radiator?
a) C2H6(OH)2
b) C3H6(OH)2
c)
d)

11) Which of the following 0.10 M aqueous solution will have the lowest freezing point?
a)
b)
c) KI
d)

12) Which of the following aqueous solutions will have the highest depression in freezing point?
a) 0.1 M urea
b) 0.1 M sucrose
c)
d)

13) Which of the following will have the highest boiling point at 1 atm pressure?
a) 0.1 M NaCl
b) 0.1 M Sucrose
c)
d) 0.1 M glucose

14) Which among the following will show the maximum osmotic pressure?
a) 1 M NaCl
b)
c)
d)

15) Which of the following colligative properties can provide the molar mass of proteins (or polymers or colloids) with the greatest precision?
a) Depression in freezing point
b) Osmotic pressure
c) Relative lowering of vapour pressure
d) Elevation of boiling point

16) Which of the following does not show positive deviation from Raoults law?
a) Acetone – chloroform
b) Benzene-Acetone
c) Benzene-Ethanol
d) Benzene-Carbon tetrachloride

17) A solution of 1 molal concentration of a solute will have the maximum boiling point elevation when the solvent is
a) ethyl alcohol
b) acetone
c) benzene
d) chloroform

18) Isotonic solutions have the
a) same boiling point
b) same vapour pressure
c) same melting point
d) same osmotic pressure

19) The depression in freezing point in water for 1 M urea, 1 M glucose and 1 M NaCl are in the ratio
a) 1:2:3
b) 3:2:2
c) 1:1:2
d) none of these

20) The osmotic pressure of 0.2 molar solution of urea at is
a) 4.92 atm
b) 1 atm
c) 0.2 atm
d) 27 atm

21) 100 cc of 1.5% solution of urea is found to have an osmotic pressure of 6.0 atm and 100 cc of 3.42% solution of cane sugar is found to have an osmotic pressure of 2.4 atm. If the two solutions are mixed, the osmotic pressure of the resulting solution will be
a) 8.4 atm
b) 4.2 atm
c) 16.8 atm
d) 2.1 atm

22) A solution containing 6 g urea per litre is isotonic with a solution containing
a) 5.85 g NaCl per litre
b) 34.2 g sucrose per litre
c) 36.0 g clucose per litre
d) 6.0 g sucrose per litre

23) An aqueous solution of sucrose, containing 34.2 g/L has an osmotic pressure of 2.38 atmospheres at . For an aqueous solution of glucose, to be isotonic with this solution, it would have
a) 34.2 g/L
b) 17.1 g/L
c) 18.0 g/L
d) 36.0 g/L of glucose

24) The osmotic pressure of a solution at is 4 atmospheres. What will be its osmotic pressure at 546 K under similar conditions?
a) 4 atm.
b) 2 atm
c) 8 atm.
d) 1 atm

25) The osmotic pressure of a 5% (mass-volume) solution of cane sugar at (mol. mass sugar = 342) is
a) 4 atm
b) 5.07 atm
c) 3.55 atm
d) 2.45 atm

26) 0.6 g of a solute is dissolved in 0.1 litre of a solvent which develops an osmotic pressure of 1.23 atm at . The molecular mass of the substance is
a)
b)
c)
d) none

27) The osmotic pressure in atmospheres of 10% solution of cane sugar at is
a) 724
b) 824
c) 8.21
d) 7.21

28) Osmotic pressure is 0.0821 atm at a temperature of 300K. Find the concentration in mole/litre
a) 0.033
b) 0.066
c)
d) 3

29) What is the volume of solution containing 1 g mole of sugar that will give rise to an osmotic pressure of 1 atm at S.T.P.?
a) 224.0 litre
b) 22.4 litre
c) 2.24 litre
d) none of these

30) A 3% aqueous solution of dextrose (mol. wt. 180) is isotonic with a 2% aqueous solution of another covalent solute in water at . The molar mass of the solute is
a) 60
b) 120
c) 180
d) 90

31) A 5% solution of cane sugar (mol. wt. = 342) is isotonic with a 1% solution of substance X. The molecular weight of X is
a) 34.2
b) 171.2
c) 68.4
d) 136.8

32) A solution containing 3.3 g of a substance in 125 g benzene (b.p.=353.23 K) had a boiling point of 352.17k. If Kb for benzene is 2.53k.m-1, calculate the molecular mass of the substance.
a) 127.20
b) 131.20
c) 137.12
d) 142.72

33) The molal b.p. constant for water is . When 0.1 mole of sugar is dissolved in 200 g of water, the solution boils under a pressure of 1 atm at
a)
b)
c)
d)

34) If s and S are the solubility and the solubility product of a sparingly soluble binary electrolyte respectively, then
a) s = S
b)
c)
d) s = S/2

35) A dilute solution of AgNO3 is added slowly to a mixture containing Cl, Br and I ions of equal concentration. Which of the following precipitates will appear first?
a) AgI
b) AgBr
c) AgCl
d) No precipitate is formed

36) The solubility of a salt M2X3 is x g. mole/litre. The solubility product of the salt is
a)
b)
c)
d)

37) The solubility product of Al(OH)3 and Zn(OH)2 are 8.5 x 10-23 and 1.8 x 10-14 respectively. If both Al3+ and Zn2+ ions are present in the solution, the cation that will be precipitated first as hydroxide on adding NH4OH is
a)
b)
c) Both
d) None

38) The product of activities or concentrations of the constituent ions of a given salt raised to appropriate powers is a constant at a given temperature when its solution is
a) Unsaturated
b) Supersaturated
c) Saturated
d) Colloidal

39) In the absence of the formation of complex ions,upon the addition of a common ion, the solubility of a given salt
a) Increases
b) Decreases
c) Remains constant
d) First increases and then decreases

40) The correct representation of the solubility product constant of Ag2CrO4 is
a)
b)
c)
d)

41) If the solubility of a sparingly soluble salt of the type BA2 (giving three ions on dissociation of a molecule) is x moles per litre, then its solubility product is given by
a)
b)
c)
d)

42) Which one has the maximum solubility in liquid CCl4 ?
a)
b)
c)
d) NaCl

43) When different types of salts have nearly the same solubility product constant Ksp, the most soluble salt is that
a) Which produces the maximum number of ions
b) Which produces the minimum number of ions
c) Which produces more charge on the ions
d) None of the above

44) A solution is called saturated if the
a) Ionic concentration product < solubility product
b) Ionic concentration product > solubility product
c) Ionic concentration product = solubility product
d) None of the above

45) When HCl gas is passed through a saturated solution of common salt, pure NaCl is precipitated because
a)
b) Much water is used in dissolving HCl gas
c) Impurities in NaCl solution dissolve in HCl
d)

46) The metallic sulphide not precipitated when H2S gas is passed through an aqueous solution containing cuprous chloride, bismuth chloride,mercuric chloride and sodium chloride is
a) CuS
b)
c) HgS
d)

47) When an ion is added to the solution of a certain sparingly soluble salt, a complex which is more soluble than the original salt is formed. Under these conditions the solubility of the salt
a) Increases
b) Decreases
c) Is unaffected
d) Either of these

48) The best explanation for the solubility of MnS in dilute HCl is that the
a)
b)
c)
d)

49) A solution of AgCl is unsaturated if
a)
b)
c)
d) None of the above

50) In the precipitation of iron group in qualitative analysis, NH4Cl is added before the addition of NH4OH
a) To prevent the interference of phosphate
b)
c)
d) To prevent the precipitation of subsequent groups

51) The Ksp of CuS, Ag2S and HgS are 10-31, 10-44 and 10-54 respectively. What is the correct order for their solubilities in water ?
a)
b)
c)
d)

52) In which of the following solutions will the solubility of AgCl be maximum ?
a)
b) Water
c) 0.1 M NaCl
d) 0.1 M KC1

53) The solubility of PbCl2 is given by
a)
b)
c)
d)

54) Which is correct for an AB3 type salt ?
a)
b)
c)
d)

55) The solubility product of CaSO4 is 6.4 x 10 5. The solubility of CaSO4 in moles/ litre is
a)
b)
c)
d)

56) If the solubility of Li3Na3(AlF6)2 is A moles/litre, its solubility product is
a)
b)
c)
d)

57) The solubility of AgCl (Ksp = 1.2 x 10-10 ) in a 0.1 M NaCl solution is
a) 0.1 M
b)
c)
d)

58) The precipitate of CaF2 (Ksp = 1.7x 10-10) is obtained when equal volumes of the following are mixed:
a)
b)
c)
d)

59) A saturated solution of Ag2SO4 is 2.5 x 10 2M. The value of its solubility product is
a)
b)
c)
d)

60) If the solubility product of PbI2 is 3.2 x 10-8, its solubility will be
a)
b)
c)
d)

61) If the concentration of CrO42- ion in a saturated solution of silver chromate is 2 x 10-4M, the solubility product of silver chromate is
a)
b)
c)
d)

62) The addition of NH4Cl in the solution of NH4OH results in the
a) increase in the OH ion concentration in solution
b) decrease in the OH ion concentration in solution
c)
d)

63) Alum is a
a) Double salt
b) Mixed salt
c) Normal salt
d) Basic salt

64) Mohrs salt is a
a) Normal salt
b) Acidic salt
c) Basic salt
d) Double salt

65) Which is a mixed salt ?
a)
b) Ca(OCl)Cl
c)
d)

66) An acid with the molecular formula C7H6O3 forms three types of sodium salts, i.e., C7H5O3Na, C7H4O3Na2 and C7H3O3Na3. The basicity of the acid is
a) One
b) Two
c) Three
d) Four

67) Which statement is/are correct?
a) All Bronsted bases are also Lewis bases
b) All Bronsted bases are also Lewis acids
c) All cations are acids but all anions are not bases
d) none of the above is correct

68) Which statement is/are incorrect?
a) All Arrhenius acids are Bronsted acids
b) All Arrhenius bases are not Bronsted bases
c) H+ ion in aq. solution exists as H3O+
d) OH ion in aqueous ammonia exists as NH4OH

69) Sulphuric acid is a dibasic acid. Hence it forms
a) An acidic salt only
b) Both basic and acidic salts
c) Both acidic and normal salts
d) A double salt

70) The Cu2+ ion is
a) Acidic
b) Basic
c) Neither acidic nor basic
d) Strongly basic

71) The correct order for the strength of bases given below is
a) C2H5 > OH > C2H
b) OH > C2H5 > C2H
c) C2H > C2H5 > OH
d) C2H5 > C2H > OH

72) Which of the following is a polyprotic acid ?
a) HCl
b)
c)
d)

73) Which is correct for the equilibrium CH3COOH+ HF CH3COOH + F?
a)
b)
c) CH3COOH is the conjugate acid of CH3COOH2+
d) CH3COOH2+ is the conjugate base of CH3COOH

74) A is a weaker acid than B if:
a) A is more easily decomposed than B when heated
b) A is not as corrosive as B
c) A is less ionised than B, when dissolved in a solvent
d) None

75) The correct statement for the equilibrium. HClO4+ H2O H3O+ + ClO is:
a)
b)
c)
d) ClO4 is the conjugate base of HClO4

76) Orthophosphoric acid is
a) Tribasic
b) Dibasic
c) Monobasic
d) Tetrabasic

77) Which one of the following is the correct order of basic strength ?
a)
b)
c)
d)

78) Which of the following is the conjugate acid of [C2H5NH] ?
a)
b)
c)
d) All of the above

79) Amongst the following the one having the characteristics of a Lewis acid is
a)
b)
c)
d)

80) The correct formula of permanganic acid is.
a)
b)
c)
d)

81) K1, K2 and K3 are dissociation constants for the successive stages of dissociation of H3PO4. Which of the following statements is correct ?
a)
b)
c)
d) None of these

82) Which of the following can act both as a Bronsted acid and a Bronsted base ?
a)
b) CH3O
c)
d) CO3=

83) Why are strong acids generally used as standard solutions in acid-base titrations?
a) The pH at the equivalent point will always be seven
b) They can be used to titrate both strong and weak bases
c) Strong acids form more stable solutions than weak acids
d) The salts of strong acids do not hydrolyse

84) Sulphanilic acid is
a) A Bronsted acid but not a bare of any kind.
b) a Lewis base, but not an acid of any kind
c) Neither a base nor an acid of any kind
d) Both an acid and a base

85) A compound having the formula NH2CH2COOH may behave
a) Only as an acid
b) Only as a base
c) Both as an acid and base
d) Neither acid nor base

86) The dissociation constants of four acids, A, B, C and D are 1 x 10-3, 1 x 10-5, 1 x 10-6 and 1 x 10-5 respectively. The strongest acid is:
a) B
b) C
c) D
d) A

87) The strongest Lewis base among the following is
a)
b)
c)
d)

88) Which of the following is not an acid salt?
a)
b)
c)
d) None

89) The weakest acid is
a) HF
b)
c)
d)

90) Which of the following is not true about EDTA ?
a) It is an Arrhenius acid
b) It is a Bronsted base
c) It is a Lewis base
d) It is none of these

91) Which is the decreasing order of strength of the bases OH, NH, H – C C and CH3CH2 ?
a)
b)
c)
d)

92) Deliquescent substances are usually
a) Highly soluble in water
b) Slightly soluble in water
c) Insoluble in water
d) None of the above

93) The deliquescent substance among the following is
a)
b)
c)
d)

94) Which of the following would lose weight on exposure to air?
a) concentrated H2SO4
b) Anhydrous sodium carbonate
c) Solid NaOH
d)

95) The expression relating molality (m) and mole fraction of solute in a solution is
a)
b)
c)
d)

96) Increasing the temperature of an aqueous solution will cause
a) a decrease in molality
b) a decrease in molarity
c) a decrease in mole fraction
d) a decrease in % w/w

97) Equal volumes of 0.1 M NaoH and 0.1 M KOH are mixed. The concentration of the resulting solution will be
a) 0.1 M
b) 0.05 M
c) 0.2 M
d) 0.0 M

98) Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A <B < C?
a) B evaporates more readily than A
b) B evaporates less readily than C
c) A and B evaporate at the same rate
d) A evaporates more readily than C

99) 4.0 g of NaOH is dissolved in 100 cc solution. The normality of the solution is
a) 1.0
b) 0.1
c) 0.5
d) 0.4

100) 1000 g of a 4% solution of salt contains
a) 4 g salt
b) 4 moles of salt
c) 40 g of solvent
d) 40 g of salt


Answer :

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