Liquids MCQs for MDCAT Practice

Chemistry section, Liquids chapter. Sample questions from past PMC papers.

1. Question 1
   Why is the boiling point of methane greater than that of neon?
   • A.A molecule of methane has a greater mass than a molecule of neon.
   • B.A molecule of methane has more electrons than a molecule of neon.
   • C.Molecules of methane have stronger inter-molecular forces than those of neon.
   • D.Molecules of methane from hydrogen bonds,but those of neon do not.
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2. Question 2
   At the boiling point, added heat is used to break __ forces.
   • A.Intermolecular
   • B.Ionic
   • C.Magnetic
   • D.Nuclear
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3. Question 3
   If a block of ice is being heated, in which of the following stages would all heat energy be utilized in breaking all the hydrogen bonds only?
   • A.During the melting of ice into water
   • B.During the heating of steam
   • C.During the boiling of water
   • D.During the heating of water
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4. Question 4
   Which of the substances listed decreases the freezing point of benzene (C6H6) more than the others if a lab tech tries to dissolve 5.00 grams in 500.0 g of benzene?
   • A.E. sucrose, C12H22O11
   • B.paradichlorobenzene, C6H4Cl2
   • C.sodium chloride,NaCl
   • D.aluminum chloride, AlCl3
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5. Question 5
   Evaporation is a ____ process.
   • A.Exothermic
   • B.Spontaneous
   • C.Non-Spontaneous
   • D.None of these options are correct
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6. Question 6
   The force of attraction due to temporary dipoles is
   • A.Dipole-dipole
   • B.Dispersion force
   • C.Debye force
   • D.Ion dipole force
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7. Question 7
   To boil water at 110°C, external pressure should be:
   • A.200-760 torr
   • B.760-1200 torr
   • C.665-670 torr
   • D.660-700 torr
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8. Question 8
   Which property of water helps to maintain the integrity of lipid bilayer membranes?
   • A.Specific heat capacity
   • B.Hydrogen bonding
   • C.Cohesion and adhesion
   • D.Hydrophobic exclusion
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