Chemical Bonding and Structure Practice Questions
IB (International Baccalaureate) · IB Chemistry HL · 144 free MCQs with instant results and detailed explanations.
144
Total
39
Easy
74
Medium
31
Hard
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Sample Questions from Chemical Bonding and Structure
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Q1
Easy
Which of the following compounds exhibits hydrogen bonding?
A.
HCl
B.
NH3
C.
CH4
D.
NaCl
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Correct Answer: B
Ammonia (NH3) exhibits hydrogen bonding because it has a nitrogen atom bonded to hydrogen, allowing for strong intermolecular attractions due to the polarity of the N-H bond.
Q2
Easy
Which of the following substances has the highest boiling point due to hydrogen bonding?
A.
H2O
B.
CH4
C.
NH3
D.
CO2
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Correct Answer: A
Water (H2O) experiences strong hydrogen bonding due to the highly polar O-H bonds, resulting in a higher boiling point compared to CH4, NH3, and CO2, which do not exhibit hydrogen bonding to the same extent.
Q3
Easy
Which of the following correctly describes a covalent bond?
A.
A bond formed by the transfer of electrons.
B.
A bond formed by the sharing of electron pairs between atoms.
C.
A bond formed between a metal and a non-metal.
D.
A bond that results from the attraction between charged ions.
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Correct Answer: B
A covalent bond is specifically characterized by the sharing of electron pairs between atoms, which distinguishes it from ionic bonds that involve electron transfer.
Q4
Medium
Which of the following molecules exhibits hydrogen bonding?
A.
H2O
B.
CO2
C.
CH4
D.
N2
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Correct Answer: A
H2O (water) exhibits hydrogen bonding due to the presence of highly electronegative oxygen atoms bonded to hydrogen. This results in strong intermolecular attractions.
Q5
Medium
What type of hybridization occurs in the central atom of PF5?
A.
sp2
B.
sp3
C.
sp3d
D.
sp3d2
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Correct Answer: C
In PF5, phosphorus is the central atom and forms five bonds with fluorine, which requires an sp3d hybridization to accommodate five bonding pairs.
Q6
Medium
Which of the following types of bonding is primarily responsible for the high melting point of ionic compounds?
A.
Covalent bonding
B.
Metallic bonding
C.
Ionic bonding
D.
Hydrogen bonding
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Correct Answer: C
Ionic bonding results from the electrostatic attraction between oppositely charged ions, which creates strong interactions that require considerable energy to break, leading to high melting points.
Q7
Medium
Which molecular geometry is exhibited by a molecule with the formula AB2E2, where A is the central atom and E represents lone pairs?
A.
Tetrahedral
B.
Trigonal Bipyramidal
C.
Bent
D.
Linear
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Correct Answer: C
The molecular geometry of AB2E2 is bent due to the presence of two bonding pairs and two lone pairs on the central atom, which repel each other and cause the molecule to adopt a bent shape.
Q8
Hard
Which of the following statements best describes the hybridization of the central atom in SF6?
A.
sp3d2
B.
sp2
C.
sp3d
D.
sp3
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Correct Answer: A
The central sulfur atom in SF6 is surrounded by six fluorine atoms. This requires a hybridization scheme that accommodates six electron pairs, leading to sp3d2 hybridization. This configuration results in an octahedral molecular geometry.
Q9
Hard
Consider a molecule with the formula AX4E2, where A is the central atom and E represents lone pairs. What is the expected bond angle between the A-X bonds?
A.
90 degrees
B.
120 degrees
C.
180 degrees
D.
approximately 90 degrees
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Correct Answer: A
The molecular geometry of AX4E2 suggests an octahedral arrangement with two lone pairs. The bond angle between the A-X bonds is approximated at 90 degrees due to the symmetric positioning of the lone pairs opposite each other.
Q10
Hard
In which of the following scenarios would resonance structures most likely be used to describe a molecule?
A.
A molecule with a single bond between two carbon atoms.
B.
A molecule with a double bond and a single bond between different atoms.
C.
A molecule that has alternating single and double bonds in a ring structure.
D.
A molecule with only single bonds and no charges.
Show Answer & Explanation
Correct Answer: C
Resonance structures are used to depict molecules like those with alternating single and double bonds in a ring structure, such as benzene, where the actual structure is a hybrid of multiple representations.
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Chemical Bonding and Structure — IB (International Baccalaureate) IB Chemistry HL Practice Questions Online
This page contains 144 practice MCQs for the chapter Chemical Bonding and Structure in IB (International Baccalaureate) IB Chemistry HL. The questions are organized by difficulty — 39 easy, 74 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.