Chemistry Chapter 4 Entry Test MCQs
26. Constituent particles of solid oxygen that are linked to each other via London dispersion forces are
a. Oxygen molecules
b. Oxygen atoms
c. Double bonds
d. Oxygen ions
27. Which of the following is capable of forming H-bonding with its molecules as well as with other molecules
a. (CH3)2CO
b. HCl
c. (CH2-OH)2
d. CHCl3
28. B.P of which of these compounds does not depend upon H – bonding?
a. H2O
b. CH4
c. HF
d. NH3
29. In an experiment 0.10g of gas was found to occupy 83.1cm3 volume measured at 27oC and standard pressure. Which molecule, out of given molecules will not form hydrogen bond with another of the given molecules:
a. CH3OH
b. NH3
c. CH3CHO
d. CH3 – NH2
30. Forces of attraction within water molecule are
a. H-Bonds
b. Dipole-Dipole Forces
c. Intermolecular forces
d. Covalent bonds
31. Which gas is most soluble in water?
a. SO2
b. H2S
c. CO2
d. NH3
Vapour Pressure
32. Vapour pressure of a liquid is not affected by
a. Surface area
b. Amount of liquid
c. Volume of container
d. All of the above
33. Vapour pressure of liquid is measured when liquid and the vapours are in equilibrium it means that
a. Rate of evaporation is equal to the rate of condensation
b. Liquid and vapours have same value of kinetic energy
c. Rate of evaporation and condensation are different
d. Liquid and vapours have same heat content
34. When a liquid is evaporated
a. Temperature of liquid increases
b. Liquid molecules becomes more energetic
c. Temperature of liquid decreases
d. Both “A” and “C”
35. The evaporated molecules of a liquid have
a. lower vapour pressure
b. High forces
c. higher energy
d. different boiling point
36. Water can boil at room temperature when external pressure is:
a. 323 torr
b. 23.7 torr
c. 1489 torr
d. 700 torr
37. Vapour pressure depends upon
a. external pressure
b. Inter molecular force
c. Volume of liquid
d. surface area
38. Which of the following has highest vapour pressure at 25 0C?
a. Diethyl ether
b. Glycol
c. Water
d. Ethyl alcohol
39. Evaporation of liquid water continues at all T and
a. Becomes max at 100oC
b. Becomes zero at 0oC
c. varies inversely with temperature
d. is independent of temperature
40. Which liquid has maximum vapour pressure.
a. Ethyl ether
b. Isopentane
c. Carbon tetrachloride
d. n-pentane
41. All of the following properties are directly related to the strength of intermolecular forces, except
a. ΔHv
b. M.P
c. ΔHn
d. B.P
Boiling Point
42. Pick out the correct arrangement with respect to boiling point
a. H2O > H2Te > H2Se > H2S
b. H2O > H2Se > H2Te > H2S
c. H2O > H2S > H2Te > H2Se
d. H2O > H2S > H2Se > H2Te
43. The boiling point of H2O (100oC) is greater than that of C2H5OH (78.5oC) due to
a. No. of H-bonds are greater in H2O than in C2H5OH
b. C2H5 group is electron donating
c. The bond angles at oxygen atoms are different
d. H2O molecules are small sized
44. Distillation of liquid at reduced P is
a. Vacuum distillation
b. Fractional distillation
c. Destructive distillation
d. Reduce distillation
45. The low boiling point of hydrofluoric acid (HF) as compared to water (H2O) is due to:
a. Statement A and B are correct
b. Fluoride (F) being less electronegative than oxygen
c. Formation of one hydrogen bond by F atom per HF molecule as compared to hydrogen bonds by O atom per H2O molecule.
d. Boiling point of HF is more than the boiling point of water
46. Which factor affects the boiling point of a particular liquid
a. Heat given
b. External pressure
c. Intermolecular forces
d. Surface area
47. If we provide very large amount of heat to a liquid, its boiling point
a. Decreases
b. Remains the same
c. Varies abnormally
d. Increases
48. Glycerol boils at 290oC with slight decomposition. Impure glycerol can be purified by
a. Vacuum distillation
b. Steam distillation
c. Solvent Extraction
d. Simple distillation
49. The boiling point of H2O (100oC) is greater than that of C2H5OH (78.5oC) due to
a. C2H5 group is electron donating
b. Number of H-bonds are greater in H2O than in C2H5OH
c. H2O molecules are small sized
d. The bond angles at oxygen atoms are different
50. A correct comparison of boiling point is
a. SO3 > SO2
b. NH3 > HF
c. NH3 > H2O
d. HF > H2O