POST UTME BELLS UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the concentration of OH- ions in the resulting solution?
A. 2.0 M
B. 1.0 M
C. 0.5 M
D. 0.25 M
Question 2
The s\tandard enthalpy of combustion of methane is -890.3 kJ/mol. What is the s\tandard enthalpy of formation of methane?
A. -74.8 kJ/mol
B. -890.3 kJ/mol
C. -393.5 kJ/mol
D. -74.8 kJ/mol
Question 3
A solution contains 0.2 M NaCl. What is the concentration of Cl- ions in the solution?
A. 0.2 M
B. 0.1 M
C. 0.4 M
D. 0.3 M
Question 4
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -285.8 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -285.8 kJ/mol
Question 5
Determine the solubility of BaSO4 in 0.1 M Na2SO4 solution, given that the solubility product cons\tant (Ksp) for BaSO4 is 1.1 x 10^-10. Assume that the concentration of Ba2+ ions in the solution is 0.01 M.
A. 1.1 x 10^-7 M
B. 1.1 x 10^-6 M
C. 1.1 x 10^-5 M
D. 1.1 x 10^-4 M
Question 6
The compound with the molecular formula C2H6O is classified as?
A. Aldehyde
B. Ester
C. Alcohol
D. Ketone
Question 7
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 8
A 25.0 mL sample of 0.100 M HCl is titrated with 0.0500 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
A. 1.70
B. 2.30
C. 2.70
D. 3.30
Question 9
The diagram below shows a titration setup. Identify the part labeled 'A'.
A. Burette
B. Beaker
C. Conical flask
D. Burette s\tand
Question 10
A diagram of a titration setup is shown below. If the volume of the burette is 50 mL and the volume of the titrant added is 25 mL, calculate the concentration of the analyte.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
Determine the number of moles of oxygen gas (O2) required to react completely with 2.50 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.
A. 0.50 mol
B. 1.00 mol
C. 1.50 mol
D. 2.00 mol
Question 12
The process of removing impurities from a solution is known as?
A. Crystallization
B. Distillation
C. Filtration
D. Evaporation
Question 13
The s\tandard enthalpy of formation of H2O(g) is -241.8 kJ/mol. What is the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?
A. 0 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. 0 kJ/mol
Question 14
A sample of polystyrene has a density of 1.05 g/cm^3. If 25.0 g of the polymer is dissolved in 100.0 mL of toluene, what is the molar mass of the polymer?
A. 50000 g/mol
B. 60000 g/mol
C. 70000 g/mol
D. 80000 g/mol
Question 15
The reaction of 1-propanol with concentrated sulfuric acid produces a compound with the molecular formula C3H7OS. Identify the product.
A. Propyl hydrogen sulfate
B. Propyl sulfate
C. Propyl sulfite
D. Propyl sulfonic acid

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