POST UTME AFE BABALOLA UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of hydrocarbon has a density of 0.65 g/mL and a molar mass of 42 g/mol. What is the empirical formula of the hydrocarbon?
A. CH2
B. CH3
C. C2H4
D. C2H6
Question 2
A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?
A. 7
B. 9
C. 11
D. 13
Question 3
A solution of ammonia (NH₃) is added to a solution of hydrochloric acid (HCl) in a titration experiment. If 20.0 cm³ of the NH₃ solution is required to neutralize 30.0 cm³ of the HCl solution, calculate the concentration of the NH₃ solution.
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 4
Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant for HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 5
A 1.0-g sample of a metal is heated in a crucible until it melts. The mass of the metal oxide produced is 1.2 g. If the metal has a density of 8.0 g/cm³, calculate the volume of the metal oxide produced.
A. 0.15 cm³
B. 0.20 cm³
C. 0.25 cm³
D. 0.30 cm³
Question 6
A gas at 300 K has a pressure of 2 atm. If the temperature is increased to 400 K, what is the new pressure?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 7
A gas at 300 K has a pressure of 2 atm. If the temperature is increased to 400 K, what is the new pressure?
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 8
A mixture of 2.5 g of glu\cose (C6H12O6) and 1.5 g of fructose (C6H12O6) is dissolved in 100 mL of water. What is the osmotic pressure of the solution at 25°C?
A. 1.2 atm
B. 2.5 atm
C. 3.8 atm
D. 4.2 atm
Question 9
A 2.5-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 2.1 g, calculate the percentage yield of the metal oxide.
A. 80%
B. 85%
C. 90%
D. 95%
Question 10
A 2.0 g sample of an organic compound (C6H12O6) is dissolved in 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25.0 cm³ of the HCl solution is required to neutralize 20.0 cm³ of the NaOH solution, calculate the concentration of the HCl solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 12
A solution of hydrochloric acid is prepared by dissolving 10 g of hydrochloric acid in 100 mL of water. What is the concentration of the solution in terms of molarity?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 13
A metal (X) reacts with oxygen to form a basic oxide. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2.5 g of X is heated in air, what is the volume of oxygen required at STP?
A. 1.5 L
B. 2.5 L
C. 3.75 L
D. 5 L
Question 14
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 9
C. 11
D. 13
Question 15
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.5
B. 5.5
C. 6.5
D. 7.5

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