Chemistry Chapter 9 Solutions MCQ's

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CHEMISTRY    CH#9   (VOL-1)    SOLUTIONS


1. Molarity of pure water is
(a) 1                          (b) 18                           (c) 55.5                        (d) 6
2. 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 than that of water
3. An azeotropic mixture of two liquids boils at lower temperature than either of them when
   (a) It is saturated                                           (b) It shows positive deviation from Raoult’s law
   (c) It shows negative deviation from Raoult’s law              (d) It is metastable
4. In azeotropic mixture showing positive deviation from Raoult’s law, the volume of the mixture
   (a) Slightly more than the total volume of the components
   (b) Slightly less than the total volume of the components
   (c) Equal to the total volume of the components              (d) None of these
5. Which of the following is a pair of partially miscible liquids?
   (a) Ethyl alcohol – water                               (b) Carbon tetrachloride – water
   (c) Phenol – water                                        (d) Methyl alcohol – benzene
6. Relative lowering of vapour pressure is
   (a) Equal to the mole fraction of solute and solvent          (b) Temperature dependent
   (c) Constant when same moles of different solute are dissolved in same mass of solvent
   (d) Equal to the mole fraction of solvent
7. An ideal solution is one in which component A and B are mixed (Choose the incorrect)
   (a) ΔH = 0                (b) ΔV = 0                   (c) P = P0X2                 (d) P = P0X1
8. The temperature at which partially immiscible pair of liquid leads to the formation of a single phase are called
   (a) Transition temperature (b) Absolute temperature (c) Consulate temperature (d) Room temperature
9. Which of the following mixtures of liquids show negative deviation?
   (a) Methyl alcohol-water                              (b) Hydrochloric acid-water
   (c) Carbon disulphide-chloroform               (d) Chlorobenzene-bromobenzene
 10. Solubility curve of CaCl2.6H2O shows
      (a) Decrease is solubility with temperature (b) Increase in solubility with temperature
      (c) Discontinuous increase in solubility with temperature   (d) No effect of temperature on solubility
 11. Which of the following conditions must be fulfilled to observe the colligative property?
      (a) Solute should be non-electrolyte     (b) Solute should be non-volatile
      (c) Solution should be dilute                 (d) All above
 12. Use of antifreeze in the automobile is an important application of
      (a) Constitutive property  (b) Additive property   (c) Colligative property  (d) All above
 13. Crystalline solids, which contain water molecules in their crystals, are called
      (a) Hydrates                      (b) Hydrides                 (c) Hydrolyzed                (d) All above
 14. Which of the following solutes will cause maximum depression in freezing point when its 1 mol solution is prepared?
      (a) KCl                               (b) SrCl2                       (c) CrCl3                           (d) All above
 15. Azeotropic mixtures can be separated by
      (a) Simple distillation         (b) Fractional distillation      (c) Vacuum distillation     (d) None
 16. 10g of NaOH have been dissolved per kg of solvent. The molality of solution is
      (a) 0.25m                             (b) 0.5m                      (c) 1.0m                            (d) 2.0m
 17. In CuSO4.5H2O
      (a) Four H2O molecules are attached with Cu2+ and one H2O with SO42- ions
      (b) All H2O molecules are attached with Cu2+ ions
      (c) All H2O molecules are attached with SO42- ions
      (d) Three H2O molecules are attached with Cu2+ and one 2H2O are attached with SO42- ions
 18. 5g of glucose is dissolved for 100 cm3 of solution. The percentage of solution is
      (a) 5%                             (b) 5%                      (c) 5%                           (d) 5% 
 19. Hydrolysis of potassium acetate produces
      (a) Acidic solution              (b) Basic solution         (c) Neutral solution         (d) None of these
 20. One molal solution is that which contain one mole of solute dissolved in
      (a) 1 dm3 of solvent            (b) 1 dm3 of solution    (c) 1000 g of solvent        (d) 22.4 dm3 of solution
21. Which one of the following salts dissolved in water to form a solution with a pH lesser than 7
      (a) CH3COONa                 (b) Na2CO3                    (c) NaCl                            (d) CuSO4
22. Aqueous solution of NaCl has pH
      (a) Greater than 7              (b) Less than 7               (c) 7    
23. If 9.8 of H2SO4 is present in one dm3 of solution, the solution is
      (a) 0.1N                             (b) 0.1M                         (c) 0.1m                             (d) 0.5M
24. The sum of mole of fractions of components of a solution is equal to
      (a) Zero                             (b) One                           (c) Two                              (d) 100
25. Different solutions obey the Raoult’s law when
      (a) Solute is electrolyte                                (b) Solute is non-volatile                
      (c) Solvent is non-volatile                            (d) Solution is concentrated
26. Raoult’s law is obeyed by two miscible liquids if
      (a) ΔH = 0      (b) ΔV = 0     (c) Both ΔH and ΔV are zero   (d) Neither ΔV nor ΔH should be zero
27. Azeotropic mixture
      (a) Obey Raoult’s law                                  (b) Do not obey Raoult’s law
      (c) Boils at low temperature only                 (d) Boils at high temperature only
28. A positive deviation from Raoult’s law in solution means, the solution has
      (a) High boiling point and high vapour pressuer    (b) High boiling point and low vapour pressure
      (c) Low boiling point and low vapour pressure      (d) Low boiling point and high vapour pressure
29. In which water will cook food more easily
      (a) Saline water          (b) Pure water            (c) Alcoholic water        (d) Slight amount of HCl in water
30. Azeotropic mixture are
      (a) Constant boiling mixture                         (b) Those which boils at different temperature
      (c) Mixture of two ionic solids                     (d) Can be separated easily by distillation
31. Which is not colligative property?
      (a) Freezing point                                          (b) Elevation in boiling point      
      (c) Lowering of vapour pressure                   (d) Depression of freezing point
32. Which has maximum freezing point?
      (a) 1 m NaCl              (b) 1m KCl                (c) 1 m CaCl2                 (d) 1 m Urea
33. Which pair of mixture is called ideal solution?
      (a) Chlorobenzene and bromobenzene          (b) Water-ether
      (c) Water-alcohol                                           (d) HCl and water
34. 10% aqueous solution of glucose freezes at
       (a) 00C                       (b) Less than 00C        (c) Greater than 00C      (d) Suspnsion
35. Which contain has less heat of hydration? 
       (a) Li+                        (b) Na+                        (c) K+                             (d) Mg2+
         36. Dissolution of one mole of NaCl absorbs energy
                (a) 2.008 KJ/mol       (b) 1.008 KJ/mol         (c) 4.008 KJ/mol            (d) 3.008 KJ/mol
            37. In a solution, 7.8g of benzene (C6H6) and 46g of (C6H5CH3) is present. The mole fraction of benzene is
          (a)                          (b)                            (c)                               (d) 
         38. (A) is one molar NaCl solution and (B) is 1 molal NaCl solution
                (a) A is less concentrated than B                   (b) A is more concentrated than B
                (c) A and B are of same strength                   (d) None
         39. Use of NaCl in ice cream making is an important application of
                (a) Constitutive property    (b) Additive property   (c) Colligative property  (d) Roault’s law
         40. Which is independent of temperature?
                (a) Molarity               (b) Molality                 (c) Normality                  (d) Mole fraction











CHAPTER # 9  (ANSWER  KEY)


1
c
11
d
21
d
31
a
2
c
12
c
22
c
32
c
3
b
13
a
23
b
33
a
4
a
14
c
24
b
34
b
5
c
15
c
25
b
35
c
6
c
16
a
26
c
36
a
7
d
17
a
27
b
37
b
8
c
18
a
28
d
38
a
9
b
19
b
29
a
39
c
10
c
20
c
30
a
40
b











I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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