Pre AP Chemistry -2.2B Intermolecular Forces and Physical Properties- MCQ Exam Style Questions -New Syllabus 2025-2026
Pre AP Chemistry -2.2B Intermolecular Forces and Physical Properties- MCQ Exam Style Questions – New Syllabus 2025-2026
Pre AP Chemistry -2.2B Intermolecular Forces and Physical Properties- MCQ Exam Style Questions – Pre AP Chemistry – per latest Pre AP Chemistry Syllabus.
Question
Ethanal, CH3CHO, ethanol, C2H5OH, and methoxymethane, CH3OCH3, are three organic compounds.
Which compound has the highest boiling point and what is the interaction that causes this boiling point to be the highest?
▶️Answer/Explanation
Answer C
Question
Which statements are correct?
1 The hydrogen bonds in ice are more regularly arranged than in water.
2 The solidification of water to form ice is exothermic.
3 Pure water is less dense than ice.
Answer/Explanation
Answer B
Question
Which molecule has no overall dipole?
A CH3Cl B CH2Cl2 C CHCl3 D CCl
Answer/Explanation
Answer D
Question
Which compound has a boiling point that is influenced by hydrogen bonding?
A CH3CHO B CH3OCH3 C HCO2CH3 D HCO2H
Answer/Explanation
Answer D
Question
Which molecule has the largest overall dipole?
Answer/Explanation
Ans: B
Question
At room temperature and pressure, H2O is a liquid and H2S is a gas.
What is the reason for this difference?
A O has higher first and second ionisation energies than S.
B The covalent bond between O and H is stronger than the covalent bond between S and H.
C There is significant hydrogen bonding between H2O molecules but not between H2 molecules.
D The instantaneous dipole-induced dipole forces between H2O molecules are stronger than the instantaneous dipole-induced dipole forces between H2S molecules.
Answer/Explanation
Answer: C
Question
Nitrogen, \(N_{2}\), and carbon monoxide, CO, both have\( M_{r}\) = 28.
The boiling point of \(N_{2}\) is 77K. The boiling point of CO is 82K.
What could be responsible for this difference in boiling points?
A CO molecules have a permanent dipole, the \(N_{2}\) molecules are not polar.
B \(N_{2}\) has σ and π bonding, CO has σ bonding only.
C \( N_{2}\) has a strong N≡N bond, CO has a C=O bond.
D The CO molecule has more electrons than the \(N_{2}\) molecule.
Answer/Explanation
Ans:A
Question
P and Q are two liquid compounds with similar Mr values. Molecules of P attract each other by
hydrogen bonds. Molecules of Q attract each other by van der Waals’ forces only.
How do the properties of P and Q differ?
1 P has a higher surface tension than Q.
2 P is less soluble in water than Q.
3 P has a lower melting point than Q
The responses A to D should be selected on the basis of
Answer/Explanation
.Ans:D
Question
Pollutant oxide Y, which contains non-metallic element X, is formed in a car engine. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1mol of Y reacts with 0.5mol of gaseous oxygen molecules. X could be either nitrogen or sulfur. Which statements about X, Y and Z can be correct?
1 The oxidation number of X increases by two from Y to Z.
2 Y has an unpaired electron in its molecule.
3 Y is a polar molecule.
The responses A to D should be selected on the basis of
Answer/Explanation
Ans:A
Question
Which molecular structure will have the smallest overall dipole?
Answer/Explanation
Ans:D