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| 1 | |
Which species has one lone pair on the chlorine atom? |
| | A) | ClO- |
| | B) | ClO2- |
| | C) | ClO3- |
| | D) | ClO4- |
| | E) | HCl |
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| 2 | |
In the Lewis structure of ethylene glycol, HOCH2CH2OH, how many pairs of electrons are bonding and how many are non-bonding? |
| | A) | 11 bonding, 0 non-bonding |
| | B) | 9 bonding, 2 non-bonding |
| | C) | 8 bonding, 2 non-bonding |
| | D) | 8 bonding, 4 non-bonding |
| | E) | 9 bonding, 4 non-bonding |
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| 3 | |
How many resonance forms are required to represent the acetate ion H3CCO2-? |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
| | E) | more than 4 |
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| 4 | |
What is the NO bond order in H3CNO2 (assume all atoms obey the octet rule)? |
| | A) | 1 |
| | B) | 2 |
| | C) | 1.33 |
| | D) | 1.5 |
| | E) | 3 |
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| 5 | |
What is the formal charge on the nitrogen in hydroxylamine, H2NOH? |
| | A) | -2 |
| | B) | -1 |
| | C) | 0 |
| | D) | +1 |
| | E) | +2 |
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| 6 | |
Consider the resonance forms of the carbonate ion (CO32-) and determine the average charge on each oxygen. |
| | A) | 0 |
| | B) | 1 |
| | C) | -1 |
| | D) | -2/3 |
| | E) | -1/2 |
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| 7 | |
In which of the following species is the octet rule violated by the central atom? |
| | A) | CH4 |
| | B) | SF4 |
| | C) | PCl4+ |
| | D) | SO2 |
| | E) | NH3 |
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| 8 | |
Estimate the standard enthalpy change ΔH° for the reaction below:
C2H4(g) + H2(g) → C2H6(g)
Data: Bond energies in kJ/mol: H-H, 432; C-H, 415; C-C, 345; C=C, 615 |
| | A) | -280 kJ |
| | B) | -180 kJ |
| | C) | -128 kJ |
| | D) | +974 kJ |
| | E) | -228 kJ |
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| 9 | |
Estimate the standard enthalpy change ΔH° for the reaction below:
2H2(g) + O2(g) → 2H2O(g)
Data: Bond energies, in kJ/mol: H-H, 432; O=O, 494; H-O, 459 |
| | A) | -239 kJ |
| | B) | +239 kJ |
| | C) | -478 kJ |
| | D) | +478 kJ |
| | E) | None of the above. |
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| 10 | |
Which of the following has the smallest bond angles? |
| | A) | CO2 |
| | B) | SO2 |
| | C) | SO3 |
| | D) | SO42- |
| | E) | XeF4 |
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| 11 | |
Which of the following has the smallest bond angles? |
| | A) | H2O |
| | B) | NH3 |
| | C) | CH4 |
| | D) | H3O+ |
| | E) | NH4+ |
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| 12 | |
Given that the F-Cl-F bond angles in ClF3 are 180° and 90°, predict the geometry of the molecule. |
| | A) | seesaw |
| | B) | trigonal pyramidal |
| | C) | trigonal planar |
| | D) | tetrahedral |
| | E) | none of the above |
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| 13 | |
In the hemoglobin molecule which carries oxygen molecules in blood, iron has 6 single bonds to surrounding atoms. What is the most likely geometry of these bonds to iron? |
| | A) | planar |
| | B) | linear |
| | C) | tetrahedral |
| | D) | octahedral |
| | E) | trigonal pyramidal |
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| 14 | |
According to VSEPR model, which of the following correctly lists electron-pair repulsions from the strongest to the weakest? |
| | A) | lone pair - bonding pair > lone pair - lone pair > bonding pair - bonding pair |
| | B) | bonding pair - bonding pair > lone pair - lone pair > lone pair - bonding pair |
| | C) | lone pair - lone pair > bonding pair - bonding pair > lone pair - bonding pair |
| | D) | lone pair - lone pair > lone pair - bonding pair > bonding pair - bonding pair |
| | E) | bonding pair - bonding pair > lone pair - lone pair > lone pair - bonding pair |
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| 15 | |
Which molecule has no dipole moment? |
| | A) | H2O |
| | B) | XeF4 |
| | C) | CO |
| | D) | SO2 |
| | E) | BrF3 |
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