POST UTME DELSU 2025 Chemistry | Objective

Are you preparing for POST UTME DELSU 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 type of reaction that occurs when sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
A. Combustion reaction
Correct B. Oxidation-reduction reaction
C. Neutralization reaction
D. Synthesis reaction

Correct Answer: B

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Question 2
A 2.5 L flask contains 0.150 mol of an ideal gas at 27°C. Calculate the pressure of the gas.
A. 1.01 × 10^5 Pa
Correct B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa

Correct Answer: B

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Question 3
The diagram below shows a titration setup.
A. The burette contains a strong acid.
Correct B. The burette contains a strong base.
C. The beaker contains a strong acid.
D. The beaker contains a strong base.

Correct Answer: B

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Question 4
Calculate the s\tandard enthalpy change for the reaction: 2NO(g) + O2(g) → 2NO2(g).
A. -112.0 kJ/mol
Correct B. -222.0 kJ/mol
C. -332.0 kJ/mol
D. -442.0 kJ/mol

Correct Answer: B

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Question 5
A 0.500 L flask contains 0.0200 mol of an ideal gas at 25°C. Calculate the number of moles of gas that would be present in a 1.00 L flask at 30°C.
A. 0.0100 mol
B. 0.0200 mol
Correct C. 0.0300 mol
D. 0.0400 mol

Correct Answer: C

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Question 6
Determine the number of moles of oxygen gas (O2) required to react with 2.50 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.
Correct A. 1.25 moles
B. 2.50 moles
C. 3.75 moles
D. 5.00 moles

Correct Answer: A

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Question 7
A 0.500 M solution of sodium hydroxide (NaOH) is mixed with 25.0 mL of 0.100 M hydrochloric acid (HCl). What is the resulting pH of the solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 8
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.50 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.0500 g/L
B. 0.100 g/L
C. 0.200 g/L
Correct D. 0.500 g/L

Correct Answer: D

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Question 9
A gas at 25°C and 1.00 atm is compressed to 2.00 atm. What is the new volume of the gas?
A. 0.500 L
Correct B. 1.00 L
C. 2.00 L
D. 4.00 L

Correct Answer: B

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Question 10
A metal sample has a density of 8.00 g/cm³ and a mass of 25.0 g. What is the volume of the sample?
A. 3.13 cm³
Correct B. 6.25 cm³
C. 12.5 cm³
D. 25.0 cm³

Correct Answer: B

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Question 11
A 2.50 g sample of a compound containing only carbon and hydrogen is combusted in a bomb calorimeter. The heat of combustion is found to be - 37.3 kJ/g. The molar mass of the compound is 46.0 g/mol. What is the s\tandard enthalpy of formation of the compound?
Correct A. - 166.5 kJ/mol
B. - 166.6 kJ/mol
C. - 166.7 kJ/mol
D. - 166.8 kJ/mol

Correct Answer: A

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Question 12
A 0.500 M solution of a weak acid HA is 10.0% dissociated. What is the concentration of H+ ions in the solution?
Correct A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: A

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Question 13
A 2.00 L flask contains 0.500 atm of N2 gas at 298 K. What is the pressure of the gas in the flask if it is expanded to a volume of 4.00 L?
A. 0.125 atm
Correct B. 0.250 atm
C. 0.500 atm
D. 1.00 atm

Correct Answer: B

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Question 14
A 25.0 mL sample of a 0.500 M solution of NaOH is mixed with 25.0 mL of a 0.500 M solution of HCl. What is the concentration of the resulting solution?
A. 0.250 M
B. 0.500 M
Correct C. 0.750 M
D. 1.00 M

Correct Answer: C

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Question 15
A 1.00 g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of CO2 produced is 2.50 L at 298 K and 1.00 atm. What is the empirical formula of the compound?
A. CH
Correct B. C2H2
C. C2H4
D. C2H6

Correct Answer: B

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