POST UTME BSU 2018 Chemistry | Objective

Are you preparing for POST UTME BSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 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 solution containing 0.1 M HCl and 0.1 M NaOH.
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
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s). The s\tandard enthalpy of formation of Al2O3(s) is -1675 kJ/mol, and the s\tandard enthalpy of formation of Fe(s) is -13.8 kJ/mol.
Correct A. -1631.8 kJ/mol
B. -1631.8 kJ/mol
C. -1631.8 kJ/mol
D. -1631.8 kJ/mol

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A 2.5 M solution of H2SO4 is titrated with 1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
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 metal M reacts with oxygen to form a basic oxide MO. The s\tandard enthalpy of formation of MO is -823 kJ/mol. Calculate the s\tandard enthalpy of formation of M.
Correct A. -823 kJ/mol
B. -823 kJ/mol
C. -823 kJ/mol
D. -823 kJ/mol

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A diagram of a titration setup is shown below. Identify the part labeled A.
Correct A. Burette
B. Beaker
C. Conical Flask
D. Pipette

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
Determine the pH of a 0.1 M solution of HCl.
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 7
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the reaction is complete?
A. 7
B. 8
C. 9
Correct D. 10

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
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 9
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 7
B. 8
C. 9
Correct D. 10

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
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 11
Determine the s\tandard enthalpy of formation of NH3(g) from the following data: ΔHf(H2(g)) = -285.8 kJ/mol, ΔHf(N2(g)) = 0 kJ/mol, ΔHf(NH3(g)) = -45.9 kJ/mol. Assume that the reaction is: H2(g) + 1/2N2(g) → NH3(g).
A. -46.0 kJ/mol
B. -45.5 kJ/mol
Correct C. -45.9 kJ/mol
D. -46.5 kJ/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 10.0 mL of NaOH has been added.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
The reaction between CH3OH(l) and HCl(g) is: CH3OH(l) + HCl(g) → CH3Cl(g) + H2O(l). Calculate the equilibrium cons\tant (Kc) for this reaction at 298 K, given the following data: ΔH = -40.0 kJ/mol, ΔS = -120 J/mol·K.
A. 1.00
B. 1.50
Correct C. 2.00
D. 2.50

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
A 2.00 M solution of K2Cr2O7 is titrated with 1.00 M HCl. Calculate the number of moles of K2Cr2O7 required to react with 25.0 mL of 1.00 M HCl.
A. 0.0500 mol
Correct B. 0.0505 mol
C. 0.0510 mol
D. 0.0515 mol

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A 1.00 M solution of NaOH is titrated with 1.00 M HCl. Calculate the pH of the solution after 20.0 mL of HCl has been added.
A. 2.00
B. 2.50
Correct C. 3.00
D. 3.50

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
Determine the number of moles of H2O2 (hydrogen peroxide) that can be obtained from 2.5 moles of H2O (water) if the reaction is: 2H2O(l) → H2O2(aq) + 2H+(aq).
A. 1.25 moles
B. 2.5 moles
Correct C. 3.75 moles
D. 5 moles

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
A 25 mL sample of a solution containing 0.1 M NaOH (sodium hydroxide) is titrated with 0.1 M HCl (hydrochloric acid). What is the pH of the solution after the titration?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
A metal (M) reacts with oxygen to form a basic oxide. The reaction is: 4M + 3O2 → 2M2O3. If 2.5 moles of M react, what is the number of moles of O2 consumed?
A. 1.25 moles
Correct B. 2.5 moles
C. 3.75 moles
D. 5 moles

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A solution containing 0.05 M HCl (hydrochloric acid) is mixed with a solution containing 0.05 M NaOH (sodium hydroxide). What is the pH of the resulting solution?
A. 1
B. 2
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
A 10 mL sample of a solution containing 0.1 M H2SO4 (sulfuric acid) is titrated with 0.1 M NaOH (sodium hydroxide). What is the pH of the solution after the titration?
A. 1
B. 2
Correct C. 7
D. 14

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
Determine the molar mass of a polymer with the repeating unit [C6H7O2]n. The polymer has a degree of polymerization (n) of 250.
A. 150 g/mol
B. 300 g/mol
Correct C. 600 g/mol
D. 1200 g/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
A sample of a non-metallic oxide has a mass of 2.5 g and a volume of 1.5 cm3. If the density of the oxide is 3.5 g/cm3, what is its molar mass?
A. 40 g/mol
B. 60 g/mol
Correct C. 80 g/mol
D. 100 g/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
A solution of NaCl is prepared by dissolving 25 g of NaCl in 100 g of water. What is the concentration of the solution in g/L?
A. 0.25 g/L
B. 0.5 g/L
Correct C. 1.0 g/L
D. 2.0 g/L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2M2O3. If 2.5 g of M is used, what is the volume of O2 required in liters?
A. 0.5 L
B. 1.0 L
Correct C. 1.5 L
D. 2.0 L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
A solution of HCl is prepared by dissolving 20 g of HCl in 100 g of water. What is the concentration of the solution in g/L?
A. 0.2 g/L
B. 0.4 g/L
Correct C. 0.6 g/L
D. 0.8 g/L

Correct Answer: C

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