Syllabus Edition
First teaching 2014
Last exams 2024
1 markWhich of the following can form a sigma (σ) bond?
I. Overlap between an s-orbital and a p-orbital
II. Overlap between two s-orbitals
III. Overlap between two p-orbitals
I only
I and II only
II and III only
I, II and III
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1 markWhat is the correct number of sigma (σ) and pi (π) bonds in ethanoic anhydride, CH3COOCOCH3?
| Number of sigma (σ) bonds | Number of pi (π) bonds | |
| A. | 10 | 4 |
| B. | 10 | 2 |
| C. | 12 | 2 |
| D. | 12 | 4 |
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1 markWhich element does not form stable compounds that break the octet rule?
Sulfur
Oxygen
Boron
Chlorine
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1 markWhat are the bond angles in a molecule with five electron domains, XY5?
| Axial bond angles / o | Equatorial bond angles / o | |
| A. | 90 | 90 |
| B. | 120 | 90 |
| C. | 90 | 120 |
| D. | 120 | 120 |
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1 markWhat is the correct formula to work out the formal charge on an atom?
FC = (Number of valence electrons) - 
(Number of bonding electrons) - (Number of non-bonding electrons)
FC = (Number of valence electrons) - (Number of bonding electrons) - (Number of non-bonding electrons)
FC = (Number of valence electrons) - (Number of non-bonding electrons) - (Number of bonding electrons)
FC = (Number of valence electrons) - (Number of non-bonding electrons) - (Number of bonding electrons)
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1 markThe structure of benzoic acid is shown below:
What is the correct number of sigma (σ) bonds and pi (π) electrons in benzoic acid?
| Number of sigma bonds | Number of pi electrons | |
| A. | 10 | 6 |
| B. | 15 | 8 |
| C. | 17 | 4 |
| D. | 9 | 10 |
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1 markWhich of the following correctly describes the F-S-F bond angles in sulfur tetrafluoride, SF4?
| Axial F-S-F bond angle / ° | Equatorial F-S-F bond angle / ° | |
| A. | 90 | 120 |
| B. | <90 | >120 |
| C. | <90 | <120 |
| D. | >90 | <120 |
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1 markWhich of the following species is polar?
ICl4-
PF5
SO3
SH2
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1 markWhat are the formal charges on the atoms labelled 1, 2 and 3 on the hydrogen phosphate ion, HPO42-?
| Formal charge on atom 1 | Formal charge on atom 2 | Formal charge on atom 3 | |
| A. | 0 | 0 | -1 |
| B. | 0 | +1 | -1 |
| C. | -1 | 0 | -1 |
| D. | +1 | -2 | 0 |
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1 markThe structure of the DNA base cytosine is shown below:
What is the correct number of sp3 and sp2 orbitals in a cytosine molecule?
| Number of sp3 orbitals | Number of sp2 orbitals | |
| A. | 2 | 6 |
| B. | 12 | 12 |
| C. | 9 | 15 |
| D. | 8 | 18 |
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Which of the following statements are true for XeO3?
I and II only
I and III only
II and III only
I, II and III
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Which species breaks the octet rule?
PCl3
BF4-
SCl4
NH4+
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Which molecule is trigonal bipyramidal in shape?
PCl3
SiCl4
PCl5
SF6
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How many sigma (σ) and pi (π) bonds are there in the following molecule?
|
|
Sigma (σ) bonds |
Pi (π) bonds |
|
A |
9 |
2 |
|
B |
9 |
4 |
|
C |
11 |
2 |
|
D |
11 |
4 |
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Which combination correctly describes the geometry of BrF4- ?
|
|
Electron domain geometry around Br |
Molecular geometry around Br |
|
A |
Octahedral |
Tetrahedral |
|
B |
Tetrahedral |
Square planar |
|
C |
Octahedral |
Square planar |
|
D |
Tetrahedral |
Tetrahedral |
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