POST UTME NOUN 2017 Chemistry | Objective

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Question 1 View Details
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2 View Details
A sample of a polymer has a molecular weight of 50000 g/mol. If the degree of polymerization is 200, what is the molar mass of the repeating unit?
Correct A. 250
B. 500
C. 750
D. 1000

Correct Answer: A

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Question 3 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 4 View Details
A diagram of a titration setup is shown below.
A. The burette contains NaOH.
Correct B. The burette contains HCl.
C. The beaker contains NaOH.
D. The beaker contains HCl.

Correct Answer: B

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Question 5 View Details
A diagram of a chemical apparatus is shown below.
Correct A. The test tube contains NaOH.
B. The test tube contains HCl.
C. The burette contains NaOH.
D. The burette contains HCl.

Correct Answer: A

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Question 6 View Details
A mixture of 0.5 mol of CO2 and 0.3 mol of O2 is heated to 500 K. Assuming ideal gas behavior, calculate the total pressure of the mixture u\sing the van der Waals equation.
A. 10.2 atm
Correct B. 12.5 atm
C. 15.8 atm
D. 18.1 atm

Correct Answer: B

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Question 7 View Details
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. Calculate the molar mass of the repeating unit.
A. 250 g/mol
Correct B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol

Correct Answer: B

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Question 8 View Details
A metal has a density of 8.5 g/cm^3 and a molar mass of 65 g/mol. Calculate the number of moles of metal in 100 g of the metal.
A. 1.5 mol
Correct B. 2.0 mol
C. 2.5 mol
D. 3.0 mol

Correct Answer: B

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Question 9 View Details
A solution of 10 g of NaCl in 100 g of water has a boiling point elevation of 0.5°C. Calculate the molality of the solution.
A. 0.1 m
Correct B. 0.2 m
C. 0.3 m
D. 0.4 m

Correct Answer: B

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Question 10 View Details
A mixture of 0.5 mol of CO2 and 0.3 mol of O2 is heated to 500 K. Assuming ideal gas behavior, calculate the total pressure of the mixture u\sing the ideal gas law.
A. 10.2 atm
Correct B. 12.5 atm
C. 15.8 atm
D. 18.1 atm

Correct Answer: B

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Question 11 View Details
Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of carbon monoxide (CO) in the following equation: 2CO + O2 → 2CO2.
Correct A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles

Correct Answer: A

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Question 12 View Details
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.03 atm, what is the mole \fraction of nitrogen gas?
Correct A. 0.97
B. 0.98
C. 0.99
D. 1.00

Correct Answer: A

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Question 13 View Details
A solution contains 2.5 g of sodium chloride (NaCl) dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.25 M
Correct B. 0.50 M
C. 0.75 M
D. 1.00 M

Correct Answer: B

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Question 14 View Details
A sample of sulfur dioxide gas (SO2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.03 atm, what is the mole \fraction of sulfur dioxide gas?
Correct A. 0.97
B. 0.98
C. 0.99
D. 1.00

Correct Answer: A

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Question 15 View Details
A solution contains 5.0 g of sodium hydroxide (NaOH) dissolved in 100 mL of water. What is the molarity of the solution?
A. 0.50 M
B. 0.75 M
Correct C. 1.00 M
D. 1.25 M

Correct Answer: C

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Question 16 View Details
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of zinc in this reaction?
A. 0
Correct B. +2
C. -2
D. +1

Correct Answer: B

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Question 17 View Details
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the resulting solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 18 View Details
The half-life of a radioactive subs\tance is 5.0 days. If 100 mg of the subs\tance is initially present, what is the amount of the subs\tance remaining after 10 days?
Correct A. 25 mg
B. 50 mg
C. 75 mg
D. 100 mg

Correct Answer: A

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Question 19 View Details
A 2.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 40.0 g of HCl in 250 mL of water. What is the pH of the resulting solution?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 20 View Details
A solution of sodium hydroxide (NaOH) is prepared by dissolving 20.0 g of NaOH in 250 mL of water. What is the pOH of the resulting solution?
A. 1.0
B. 2.0
Correct C. 3.0
D. 4.0

Correct Answer: C

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Question 21 View Details
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.76
Correct B. 5.76
C. 6.76
D. 7.76

Correct Answer: B

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Question 22 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 23 View Details
A 0.1 M solution of a weak acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 8. What is the pKa of the acid?
A. 4.76
B. 5.76
Correct C. 6.76
D. 7.76

Correct Answer: C

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Question 24 View Details
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 25 View Details
A 0.1 M solution of a strong acid is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.76
B. 5.76
C. 6.76
Correct D. 7.76

Correct Answer: D

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