POST UTME IGBINEDION UNIVERSITY 2022 Chemistry | Objective

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Question 1
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?
Correct A. 3.125 L
B. 2.5 L
C. 5 L
D. 6.25 L

Correct Answer: A

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Question 2
A solution of HCl is titrated with a solution of NaOH. The initial pH of the solution is 2. If 25 mL of NaOH is added, the pH increases to 3. What is the concentration of HCl in the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

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Question 3
The element with atomic number 12 is _______.
A. Mg
Correct B. Ca
C. Mn
D. Fe

Correct Answer: B

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Question 4
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?
Correct A. 3.125 L
B. 2.5 L
C. 5 L
D. 6.25 L

Correct Answer: A

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Question 5
A solution of HCl is titrated with a solution of NaOH. The initial pH of the solution is 2. If 25 mL of NaOH is added, the pH increases to 3. What is the concentration of HCl in the solution?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 2 M

Correct Answer: B

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Question 6
A 2.50 L sample of a gas at 27°C is collected over water at 27°C. The total pressure is 755 mmHg. Calculate the partial pressure of the gas.
A. 550 mmHg
B. 600 mmHg
Correct C. 650 mmHg
D. 700 mmHg

Correct Answer: C

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Question 7
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 25.0 mL of NaOH has been added.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

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Question 8
A 100.0 g sample of a polymer is dissolved in 100.0 mL of solvent. The solution has a vis\cosity of 100.0 cP. Calculate the molar mass of the polymer.
A. 1000 g/mol
B. 2000 g/mol
Correct C. 3000 g/mol
D. 4000 g/mol

Correct Answer: C

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Question 9
A 1.00 L sample of a gas at 25°C is collected over water at 25°C. The total pressure is 760 mmHg. Calculate the partial pressure of the gas.
A. 750 mmHg
B. 800 mmHg
Correct C. 850 mmHg
D. 900 mmHg

Correct Answer: C

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Question 10
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 50.0 mL of NaOH has been added.
A. 1.00
B. 1.50
Correct C. 2.00
D. 2.50

Correct Answer: C

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Question 11
The polymerization of styrene to polystyrene is an example of a ______ reaction.
A. chain-growth
B. step-growth
C. condensation
Correct D. addition

Correct Answer: D

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Question 12
The rate of a chemical reaction is affected by the ______ of the reac\tants.
Correct A. concentration
B. temperature
C. pressure
D. volume

Correct Answer: A

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Question 13
The reaction of zinc with copper(II) sulfate produces ______ and ______.
A. zinc sulfate, copper
Correct B. copper, zinc sulfate
C. zinc, copper(II) sulfate
D. copper(II) sulfate, zinc

Correct Answer: B

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Question 14
The diagram below shows the structure of a ______ molecule.
Correct A. methane
B. ethane
C. propane
D. bu\tane

Correct Answer: A

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Question 15
The reaction of sodium with water produces ______ and ______.
Correct A. sodium hydroxide, hydrogen
B. hydrogen, sodium hydroxide
C. sodium, water
D. water, sodium

Correct Answer: A

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Question 16
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 17
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. The half-reactions are: Fe2+ → Fe3+ + e- and MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. What is the overall reaction?
Correct A. Fe2+ + MnO4- → Fe3+ + Mn2+
B. Fe2+ + MnO4- → Fe3+ + MnO2
C. Fe2+ + MnO4- → Fe + Mn2+
D. Fe2+ + MnO4- → Fe3+ + MnO2

Correct Answer: A

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Question 18
A 1.0 L solution of 0.1 M NaCl is electrolyzed u\sing a current of 1.0 A for 2.0 hours. What is the mass of Cl2 produced?
Correct A. 0.5 g
B. 1.0 g
C. 2.0 g
D. 4.0 g

Correct Answer: A

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Question 19
A 1.0 L solution of 0.1 M H2SO4 is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 20
A 1.0 L solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1
Correct B. 7
C. 10
D. 14

Correct Answer: B

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Question 21
A 2.50 g sample of a compound containing only carbon and hydrogen is found to have an empirical formula of CH2O. Calculate the molar mass of the compound.
A. 46.05 g/mol
Correct B. 46.07 g/mol
C. 46.10 g/mol
D. 46.15 g/mol

Correct Answer: B

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Question 22
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
Correct A. 0.00250 mol
B. 0.00275 mol
C. 0.00300 mol
D. 0.00325 mol

Correct Answer: A

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Question 23
A 1.00 L sample of a gas at 25°C and 1.00 atm is found to have a volume of 2.00 L at 50°C. Calculate the number of moles of gas present.
A. 0.0100 mol
Correct B. 0.0125 mol
C. 0.0150 mol
D. 0.0175 mol

Correct Answer: B

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Question 24
A 2.00 g sample of a compound containing only carbon and hydrogen is found to have an empirical formula of CH2O. Calculate the molar mass of the compound.
A. 46.05 g/mol
Correct B. 46.07 g/mol
C. 46.10 g/mol
D. 46.15 g/mol

Correct Answer: B

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Question 25
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
Correct A. 0.00250 mol
B. 0.00275 mol
C. 0.00300 mol
D. 0.00325 mol

Correct Answer: A

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