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UNE GENERAL CHEMISTRY II
2026/2027 LATEST UPDATE EXAM
|ACTUAL QUESTIONS WITH
VERIFIED ANSWERS |100%
VERRIFIED SOLUTIONS !!!
Verified Practice Questions with Answers and Rationales
Intermolecular Forces & Properties of Liquids
1) A hydrogen bond is characterized by:
A) The attraction of temporary dipoles produced by random electron motion asymmetries
B) The electrostatic attraction between permanent dipoles in any polar molecule
C) A highly concentrated partial charge interaction between an H atom and F, O, or N atoms
D) The covalent sharing of electrons between two atoms in a molecule
Correct Answer: C
A hydrogen bond is a special type of dipole-dipole interaction that occurs when a hydrogen
atom is bonded to a highly electronegative atom (F, O, or N). The partial positive charge on
H is strongly attracted to the partial negative charge on F, O, or N of another molecule.
Option A describes London dispersion forces, B describes general dipole-dipole forces,
and D describes covalent bonds .
2) Which of the following will have the strongest dipole-dipole attractions?
A) NCl₃
B) CCl₄
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C) BCl₃
D) Cl₂
Correct Answer: A
NCl₃ is asymmetrical and has a significant dipole moment due to the electronegativity
difference between N and Cl. CCl₄ and Cl₂ are nonpolar molecules with symmetrical
structures that cancel dipoles. BCl₃ is trigonal planar and nonpolar despite polar bonds
because the bond dipoles cancel .
3) Which intermolecular force is present in ALL molecules?
A) Hydrogen bonding
B) Dipole-dipole interactions
C) London dispersion forces
D) Ionic bonding
Correct Answer: C
London dispersion forces (LDFs) are present in all molecules due to temporary fluctuations
in electron distribution. They are the only intermolecular force in nonpolar molecules and
exist alongside other forces in polar molecules .
4) Which substance would have the highest boiling point?
A) H₂O
B) H₂S
C) H₂Se
D) H₂Te
Correct Answer: A
H₂O has the highest boiling point due to hydrogen bonding, which is significantly stronger
than the dipole-dipole and London dispersion forces present in the other hydrogen
chalcogenides .
5) An adhesive force is:
A) The attraction between molecules of different substances
B) The attraction between molecules of the same substance
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C) Always stronger than a cohesive force
D) Results from covalent bond formation between molecules
Correct Answer: A
Adhesive forces are intermolecular forces that attract different types of molecules to each
other. For example, the attraction between water molecules and a glass surface is
adhesion. This contrasts with cohesive forces, which attract identical molecules .
6) Metallic solids are composed of:
A) Atoms with nuclei in a "sea" of delocalized electrons
B) Ions held together by electrostatic forces
C) Covalently bonded atoms in a network structure
D) Individual molecules held by London dispersion forces
Correct Answer: A
Metallic solids have a unique structure where metal cations are surrounded by a "sea" of
delocalized electrons that can move freely throughout the solid. This electron sea model
explains the characteristic properties of metals, including electrical conductivity,
malleability, and ductility .
7) Which of the following aqueous solutions will have the highest vapor pressure at
25°C?
A) 0.1 M NaCl
B) 0.5 M NaCl
C) 1.0 M NaCl
D) 2.0 M NaCl
Correct Answer: A
Vapor pressure is a colligative property that depends on the number of solute particles in
solution. A 0.1 M solution has the fewest solute particles, so it experiences the smallest
vapor pressure lowering and therefore has the highest vapor pressure .
Chemical Kinetics
8) Which factor increases the rate of a chemical reaction?
A) Lower temperature
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B) Lower reactant concentration
C) Higher temperature
D) Larger product concentration
Correct Answer: C
Increasing temperature raises molecular kinetic energy, leading to more frequent and
energetic collisions that overcome activation energy .
9) According to collision theory, reactions occur only when particles:
A) Have identical masses
B) Collide with sufficient energy and proper orientation
C) Move slowly
D) Are solids
Correct Answer: B
Effective collisions require both adequate energy and the correct molecular orientation .
10) A catalyst functions by:
A) Increasing activation energy
B) Lowering activation energy
C) Consuming reactants
D) Changing equilibrium constant
Correct Answer: B
Catalysts provide an alternative reaction pathway with lower activation energy .
11) Which rate law corresponds to a first-order reaction?
A) Rate = k
B) Rate = k[A]
C) Rate = k[A]²
D) Rate = k[A][B]
Correct Answer: B
A first-order reaction depends linearly on one reactant concentration .
UNE GENERAL CHEMISTRY II
2026/2027 LATEST UPDATE EXAM
|ACTUAL QUESTIONS WITH
VERIFIED ANSWERS |100%
VERRIFIED SOLUTIONS !!!
Verified Practice Questions with Answers and Rationales
Intermolecular Forces & Properties of Liquids
1) A hydrogen bond is characterized by:
A) The attraction of temporary dipoles produced by random electron motion asymmetries
B) The electrostatic attraction between permanent dipoles in any polar molecule
C) A highly concentrated partial charge interaction between an H atom and F, O, or N atoms
D) The covalent sharing of electrons between two atoms in a molecule
Correct Answer: C
A hydrogen bond is a special type of dipole-dipole interaction that occurs when a hydrogen
atom is bonded to a highly electronegative atom (F, O, or N). The partial positive charge on
H is strongly attracted to the partial negative charge on F, O, or N of another molecule.
Option A describes London dispersion forces, B describes general dipole-dipole forces,
and D describes covalent bonds .
2) Which of the following will have the strongest dipole-dipole attractions?
A) NCl₃
B) CCl₄
, Page|2
C) BCl₃
D) Cl₂
Correct Answer: A
NCl₃ is asymmetrical and has a significant dipole moment due to the electronegativity
difference between N and Cl. CCl₄ and Cl₂ are nonpolar molecules with symmetrical
structures that cancel dipoles. BCl₃ is trigonal planar and nonpolar despite polar bonds
because the bond dipoles cancel .
3) Which intermolecular force is present in ALL molecules?
A) Hydrogen bonding
B) Dipole-dipole interactions
C) London dispersion forces
D) Ionic bonding
Correct Answer: C
London dispersion forces (LDFs) are present in all molecules due to temporary fluctuations
in electron distribution. They are the only intermolecular force in nonpolar molecules and
exist alongside other forces in polar molecules .
4) Which substance would have the highest boiling point?
A) H₂O
B) H₂S
C) H₂Se
D) H₂Te
Correct Answer: A
H₂O has the highest boiling point due to hydrogen bonding, which is significantly stronger
than the dipole-dipole and London dispersion forces present in the other hydrogen
chalcogenides .
5) An adhesive force is:
A) The attraction between molecules of different substances
B) The attraction between molecules of the same substance
, Page|3
C) Always stronger than a cohesive force
D) Results from covalent bond formation between molecules
Correct Answer: A
Adhesive forces are intermolecular forces that attract different types of molecules to each
other. For example, the attraction between water molecules and a glass surface is
adhesion. This contrasts with cohesive forces, which attract identical molecules .
6) Metallic solids are composed of:
A) Atoms with nuclei in a "sea" of delocalized electrons
B) Ions held together by electrostatic forces
C) Covalently bonded atoms in a network structure
D) Individual molecules held by London dispersion forces
Correct Answer: A
Metallic solids have a unique structure where metal cations are surrounded by a "sea" of
delocalized electrons that can move freely throughout the solid. This electron sea model
explains the characteristic properties of metals, including electrical conductivity,
malleability, and ductility .
7) Which of the following aqueous solutions will have the highest vapor pressure at
25°C?
A) 0.1 M NaCl
B) 0.5 M NaCl
C) 1.0 M NaCl
D) 2.0 M NaCl
Correct Answer: A
Vapor pressure is a colligative property that depends on the number of solute particles in
solution. A 0.1 M solution has the fewest solute particles, so it experiences the smallest
vapor pressure lowering and therefore has the highest vapor pressure .
Chemical Kinetics
8) Which factor increases the rate of a chemical reaction?
A) Lower temperature
, Page|4
B) Lower reactant concentration
C) Higher temperature
D) Larger product concentration
Correct Answer: C
Increasing temperature raises molecular kinetic energy, leading to more frequent and
energetic collisions that overcome activation energy .
9) According to collision theory, reactions occur only when particles:
A) Have identical masses
B) Collide with sufficient energy and proper orientation
C) Move slowly
D) Are solids
Correct Answer: B
Effective collisions require both adequate energy and the correct molecular orientation .
10) A catalyst functions by:
A) Increasing activation energy
B) Lowering activation energy
C) Consuming reactants
D) Changing equilibrium constant
Correct Answer: B
Catalysts provide an alternative reaction pathway with lower activation energy .
11) Which rate law corresponds to a first-order reaction?
A) Rate = k
B) Rate = k[A]
C) Rate = k[A]²
D) Rate = k[A][B]
Correct Answer: B
A first-order reaction depends linearly on one reactant concentration .
