Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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Which of the following statements concerning equal volumes of gases
N2O and C3H8 , at the same temperature and pressure, is
true?
A) | They have the same density | B) | They have the same number of
moleucles | C) | The have the same number of atoms | D) | Both A and B |
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2.
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What is the partial pressure of oxygen in a mixture containg 16 g of
O2 and 16 g of SO2 gas and a total pressure of 660 mmHg?
A) | 440 mmHg | B) | 220 mmHg | C) | 330
mmHg | D) | 110 mmHg |
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3.
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Based on the reaction shown below, which of the following statements is
correct? A) | Silicon is reduced and oxygen is oxidized | B) | Oxygen is reduced
and carbon is oxidized | C) | Silicon is oxidized, and carbon is
reduced | D) | Silicon is reduced and carbon is oxidized |
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4.
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A 5.0-L sample of Ar gas at constant temperature and a pressure of 0.25 atm is
compressed to a volume of 5.0 mL. What is the final pressure?
A) | 250 atm | B) | 0.025 atm | C) | 25
atm | D) | 2.5 atm |
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5.
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What volume of 1.00 M sodium hydroxide is required to react completely with 50.0
mL of 3.00 M sulfuric acid?
A) | 50.0 mL | B) | 300. mL | C) | 200.
mL | D) | 150. mL |
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6.
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A sample of Xe takes 75 seconds to effuse out of a container. An unknown
gas takes 37 seconds to effuse out of the identical container under identical conditions. What
is the most likelly identity of the unknown gas?
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7.
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A compound contains 40.0% C, 6.7% H, and 53.3% O, with a molar mass of 60.0
g. What is the molecular formula for this compound?
A) | C3H8O | B) | CH2O | C) | C2H4O | D) | C2H4O2 |
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8.
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A compound of chromium and silicon contains 73.52% by mass chromium. What
is its empirical formula?
A) | Cr3Si2 | B) | CrSi3 | C) | Cr2Si3 | D) | Cr3Si |
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9.
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A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH.
What is the mass percent of acetic acid in vinegar?
A) | 9.23 % | B) | 0.184 % | C) | 3.26
% | D) | 5.43 % |
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10.
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What is the final pressure of the system when the valve between the two bulbs is
opened in the diagram below? (Assume constant temperature) A) | 1.3 atm | B) | 2.0 atm | C) | 2.5
atm | D) | 0.50 atm |
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11.
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Which of the following can act both as an oxidizing and a reducing
agent?
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12.
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Which of the following are redox reactions? A) | A only | B) | A and B | C) | A, B and
C | D) | A, B, C and D |
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13.
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Which of the following statements is correct concerning the reaction shown
below: A) | The flourine atom is gaining electrons, therefore it is oxidized. | B) | The barium atom is
gaining electrons, therefore it is oxidized. | C) | The fluorine atom is losing electrons,
therefore it is reduced. | D) | The barium atom is losing electrons, therefore
it is oxidized. |
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14.
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A compound of chromium and silicon contains 73.52% by mass chromium. What
is its empirical formula?
A) | Cr3Si | B) | Cr3Si2 | C) | CrSi3 | D) | Cr2Si3 |
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15.
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If the formula for barium cerate is BaCeO3, what is the correct
formula for ferric cerate?
A) | Fe3CeO3 | B) | Fe3(CeO3)2 | C) | Fe2(CeO3)3 | D) | FeCeO3 |
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16.
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A 3.00-mol sample of each reactant will produce what volume of N 2O at
STP, as shown below: A) | 22.4 L | B) | 67.2 L | C) | 33.6
L | D) | 44.8 L |
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17.
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Which of the following is the correct sequence of coefficients when the equation
below is balanced: ___H 3PO 4 +
___ MgCO 3  ___
Mg 3(PO 4) 2 + ___ CO 2 + ___ H 2O A) | 3, 1, 3, 2, 3 | B) | 2, 2, 1, 2, 3 | C) | 2, 3, 1, 3,
2 | D) | 2, 3, 1, 3, 3 |
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18.
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The oxidation number of sulfur in CaS2O3 is
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19.
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The partial pressures of CH4 , N2 and O2 were
found to be 100, 450, and 200 mmHg respectively. What is the mole fraction of N2 in
the mixture?
A) | 0.267 | B) | 0.333 | C) | 0.750 | D) | 0.600 |
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20.
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What is the molarity of a solution prepared by dissolving 7.31 g of
Na2SO4 in enough water to make 225 mL of solution?
A) | 3.11 M | B) | 1.64 M | C) | 0.136
M | D) | 0.229 M |
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