11th class (FSc) chemistry Unit 9 MCQs
26. …… is used as antifreeze in radiator of automobile:
a. Serotonin
b. Aspartame
c. Hydrazine
d. Ethylene glycol
27. Melting point of ice can be lowered by using:
a. AgCl
b. LiCl
c. NaCl
d. BeCl2
28. The number of water molecules in CuSO4. 5H2O with Cuion:
a. Three
b. One
c. Four
d. Two
29. Which salt when dissolved in water from a solution with pH greater than 7:
a. NH4CI
b. CuSO4
c. Na2CO3
d. NaCl
30. Molarity of water is:
a. 55.5
b. 1
c. 6
d. 18
31. 18 g glucose is dissolved in 90 g water. The relative lowering of vapour pressure is equal to:
a. 1/51
b. 1/5
c. 6
d. 5.1
32. A solution of glucose is 10% w/V. The volume in whicvh 1 g mole of itis dissolved will be:
a. 200 cm3
b. 1 dm3
c. 900 cm3
d. 1.8 dm3
33. An aqueous solution of ethanol in water may have vapour pressure:
a. More than that of water
b. Equal to that of water
c. Less then that of water
d. Equal to that of ethanol
34. An azeotropic mixture of two liquids boils at a lower temperature theneither of them when:
a. It shows negative deviation from Raoults’ law
b. It is saturated
c. It is meta-stable
d. It shows positive deviation from Raoult’s law
35. In azeotropic mixture, showing positive deviation from Raoult’s law.the volume of the mixture is:
a. Equal to total volume of components
b. Slightly more that total volume of components
c. Slightly less than total volume of components
d. None of these
36. Which of following solution has highest boliling points:
a. 6% urea solution
b. 5.85% NaCl
c. All have same boiling point
d. 18% glucose solutions
37. The solution of NaCl and KCL are prepared separately by dissolving same amount in water. Which of the following statements is false for the solutions:
a. KCl and NaCl solution posses same vapour pressure
b. KCl solution will have higher boiling point than NaCl
c. KCl solution posses lower freezing point than NaCl solution
d. Both the solution have different voiling point
38. The molal boiling point constant is the ratio of elecation in boiling pointto:
a. Mole fraction
b. Molarity
c. Molality
d. None o these
39. Colligative properties are properties of:
a. Dilute solutions which behave nearly ideal solution
b. Concentrated solutions which behave non-idealy
c. Both a and b
d. Neither a nor b
40. Mole fraction of any compound us the ratio of moles of all components in a:
a. Molecule
b. Compound
c. Solid
d. Solution
41. Molarity is define as the number of moles of any substance dissolved:
a. Per m3 of water
b. Per dm3 of water
c. In 100 ml of water
d. In one gram of water
42. As number of solute particles increase. freezing point of the solution.
a. First increase than decrease
b. Remains the same
c. Decrease
d. Increases
43. As number of solute particles increase, freezing point of the solution:
a. Pressure
b. Molar masses
c. Masse
d. Volume
44. Boiling point constants helps us to determine:
a. Pressure
b. Molar masses
c. Masses
d. Volume
45. If 18.0 g of glucose is dissolving in 1 kg of water, boiling point of this soluion should be:
a. 100.052oC
b. 100.52oC
c. Less then 100oC
d. 100.00oC
46. Molar freezing point of constant water is:
a. 11.86
b. 1.86
c. 0.52
d. 2.86
47. Given solution contains 16.0 g CH3OH, 92.0 about mole fraction of the components is true?
a. Mole fraction of C2H5OH and H2O is the same
b. Mole fraction of CHjOH is highest among all
c. Mole fraction of H2O is the lowest among all
d. Mole fraction of C2HjOH and C HSOH is same compounds
48. Freezing point will also be defined as that temperature at which its solid and liquid phases have tha same:
a. Vapour pressure
b. Concentration
c. Attraction between the phases
d. Ratio between the particles
49. What mass of NaOH is present in 0.5 mol of sodium hydroxide?
a. 15 gm
b. 40 gm
c. 20 gm
d. 2.5 gm
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