POST UTME DELSU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
B. 0.250 atm
C. 0.500 atm
D. 1.00 atm
Question 2
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
B. 6.25 cm³
C. 12.5 cm³
D. 25.0 cm³
Question 3
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
B. C2H2
C. C2H4
D. C2H6
Question 4
Calculate the s\tandard enthalpy change for the reaction: 2NO(g) + O2(g) → 2NO2(g).
A. -112.0 kJ/mol
B. -222.0 kJ/mol
C. -332.0 kJ/mol
D. -442.0 kJ/mol
Question 5
The diagram below shows a titration setup.
A. The burette contains a strong acid.
B. The burette contains a strong base.
C. The beaker contains a strong acid.
D. The beaker contains a strong base.
Question 6
A 0.500 M solution of a weak acid HA is 10.0% dissociated. What is the concentration of H+ ions in the solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 7
Determine the type of reaction that occurs when sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas.
A. Combustion reaction
B. Oxidation-reduction reaction
C. Neutralization reaction
D. Synthesis reaction
Question 8
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
B. 1.00 L
C. 2.00 L
D. 4.00 L
Question 9
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.
A. 1.25 moles
B. 2.50 moles
C. 3.75 moles
D. 5.00 moles
Question 10
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?
A. - 166.5 kJ/mol
B. - 166.6 kJ/mol
C. - 166.7 kJ/mol
D. - 166.8 kJ/mol
Question 11
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
C. 0.750 M
D. 1.00 M
Question 12
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
D. 0.500 g/L
Question 13
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
B. 2.00
C. 3.00
D. 4.00
Question 14
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
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 15
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
C. 0.0300 mol
D. 0.0400 mol

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: