POST UTME BSU 2025 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 2025 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.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 2
A 25.0 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH at the equivalence point.
A. 7
B. 8
C. 9
Correct D. 10

Correct Answer: D

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Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 4
A 25.0 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 75 mL
Correct D. 100 mL

Correct Answer: D

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Question 5
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of H+ ions in the solution.
A. 0.1 M
B. 0.01 M
C. 0.001 M
Correct D. 0.0001 M

Correct Answer: D

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Question 6
Determine the pH of a 0.01 M solution of HCl, given that 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 7
A 25 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 8
A solution contains 0.1 M NaOH and 0.1 M HCl. Calculate the pH of the solution after 10 mL of 0.1 M HCl has been added to 20 mL of 0.1 M NaOH.
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 9
A 25 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 20 mL of HCl has been added.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 10
A solution contains 0.1 M NaOH and 0.1 M HCl. Calculate the pH of the solution after 20 mL of 0.1 M HCl has been added to 20 mL of 0.1 M NaOH.
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 11
Determine the number of moles of $\text{O}_2$ that react with 2.50 moles of $\text{C}_2\text{H}_4$ according to the equation $\text{C}_2\text{H}_4 + 3\text{O}_2 \rightarrow 2\text{CO}_2 + 2\text{H}_2\text{O}$.
A. 0.50 moles
Correct B. 1.00 mole
C. 1.50 moles
D. 2.00 moles

Correct Answer: B

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Question 12
A 2.00 L flask contains 0.500 mol of an ideal gas at 298 K. If the gas is heated to 375 K, what is the new volume of the gas?
A. 1.50 L
B. 2.00 L
Correct C. 2.50 L
D. 3.00 L

Correct Answer: C

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Question 13
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: $\text{X} + \text{Cl}_2 \rightarrow \text{XCl}_3$. If 2.00 g of X reacts with 3.00 g of Cl$_2$, what is the mass of XCl$_3$ formed?
A. 4.00 g
B. 5.00 g
Correct C. 6.00 g
D. 7.00 g

Correct Answer: C

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Question 14
A 0.500 L flask contains 0.250 mol of a gas at 298 K. If the gas is compressed to 0.250 L, what is the new pressure of the gas?
A. 1.00 atm
B. 2.00 atm
Correct C. 3.00 atm
D. 4.00 atm

Correct Answer: C

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Question 15
A metal (X) reacts with oxygen gas to form a white solid. The reaction is as follows: $\text{X} + \text{O}_2 \rightarrow \text{X}_2\text{O}_3$. If 2.00 g of X reacts with 3.00 g of O$_2$, what is the mass of X$_2$O$_3$ formed?
A. 4.00 g
B. 5.00 g
Correct C. 6.00 g
D. 7.00 g

Correct Answer: C

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Question 16
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
Correct B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane

Correct Answer: B

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Question 17
The rate cons\tant for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?
Correct A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: A

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Question 18
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of the excess reac\tant after the reaction is complete?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.5 M

Correct Answer: B

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Question 19
A 10.0 g sample of a mixture of NaCl and KCl is dissolved in water and then treated with AgNO3. If 25.0 mL of 0.1 M AgNO3 is required to precipitate all the chloride ions, what is the mass of KCl in the sample?
A. 2.0 g
B. 4.0 g
Correct C. 6.0 g
D. 8.0 g

Correct Answer: C

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Question 20
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of Ba(OH)2. What is the concentration of the excess reac\tant after the reaction is complete?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 21
The reaction between chlorine gas and sodium hydroxide solution is a classic example of a redox reaction. Which of the following is the correct half-equation for the oxidation of chloride ions?
A. Cl^- → Cl2 + 2e^-
B. Cl^- → ClO^- + e^-
C. Cl^- → ClO3^- + 3e^-
Correct D. Cl^- → Cl2 + e^-

Correct Answer: D

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Question 22
The boiling point of a solution containing 10g of glu\cose in 100g of water is 100.5°C. What is the molality of the solution?
A. 0.5 m
Correct B. 1.0 m
C. 1.5 m
D. 2.0 m

Correct Answer: B

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Question 23
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution

Correct Answer: A

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Question 24
The reaction between sodium and chlorine gas is a classic example of a synthesis reaction. What is the product of this reaction?
Correct A. NaCl
B. Na2Cl2
C. NaCl2
D. Na2Cl

Correct Answer: A

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Question 25
The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette?
Correct A. To measure the volume of the acid
B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution

Correct Answer: A

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