POST UTME NOUN 2017 Chemistry | Objective

Are you preparing for POST UTME NOUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
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

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support