Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of
Safrole, a non-volatile solute, in 950 g of ethanol (C2H5OH) at 25
°C. (P°ethanol = 50.0 torr at 25 °C)
A) | 1.8 torr | B) | 11 torr | C) | 40
torr | D) | 48 torr |
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2.
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Which of the following compounds is polar?
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3.
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What is the molecular shape of NH2Cl as predicted by the VSEPR
theory?
A) | tetrahedral | B) | trigonal planar | C) | T-shaped | D) | trigonal
pyramidal |
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4.
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The bond energy for the diatomic molecule XY is greater than that of VW.
Which of the following statements is accurate?
A) | The XY bond length is shorter than the VW bond. | B) | The atomic radius of
X must be greater than that of V. | C) | The electronegativity difference between X and
Y is greater than tht of V and W. | D) | The VW bond is more polar than the XY
bond. |
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5.
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Which of the following indicates the existence of strong intermolecular forces
in a liquid?
A) | a very low boiling point | B) | a very low viscosity | C) | a very low vapor
pressure | D) | a very low heat of vaporization |
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6.
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Which of the following correctly lists the compounds in order of increasing
boiling point?
A) | CH3CH2OH <
CH3CH2OCH3 <
CH3CH2CH2OH | B) | CH3CH2OCH3 <
CH3CH2OH <
CH3CH2CH2OH | C) | CH3CH2CH2OH <
CH3CH2OH < CH3CH2OCH3
| D) | CH3CH2CH2OH <
CH3CH2OCH3 <
CH3CH2OH |
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7.
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Which of the following best represents the formal charges on the structure shown
below: A) | +1 for H, –2 for each oxygen, +5 for N | B) | 0 for all
atoms | C) | +1 for N, –1 for oxygen (c), 0 for all other atoms | D) | +1 for N and H,
–1 for oxygen (a) and (c), 0 for oxygen (b) |
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8.
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Which of the following substances would be expected to have the highest
viscosity at room temperature?
A) | C4H10 | B) | HOCH2CH2OH | C) | C8H18 | D) | C2H5NH2 |
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9.
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Which of the following would be expected to have the highest boiling
point?
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10.
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What is the molecular shape of NOCl as predicted by the VSEPR theory?
A) | tetrahedral | B) | trigonal planar | C) | linear | D) | bent |
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11.
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If 20.0 g of urea [CO(NH2)2] is dissolved in
25.0 g of water, what is the freezing point of the solution? (Kf = 1.86
°C/m)
A) | –1.40 °C | B) | –3.72 °C | C) | –2.47
°C | D) | –24.7 °C |
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12.
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What is the molecular shape for ClF3 as predicted by the VSEPR
model?
A) | T-shaped | B) | trigonal pyramidal | C) | trigonal
planar | D) | see-saw |
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13.
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Which of the following compounds displays the most ionic character it its
bonds?
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14.
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What is the approximate bond angle in AsCl3?
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15.
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Octane (C8H18) becomes a liquid because of
A) | dipole-dipole forces | B) | hydrogen bonding | C) | covalent
bonding | D) | London forces |
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16.
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In the following Lewis structure for ClO 3F, chlorine has a formal
charge of ______ and an oxidation number of _____. A) | 7, –1 | B) | 1, 1 | C) | 1,
–1 | D) | 1, 7 |
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17.
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Select the correct Lewis structure for P 2I 4.
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