POST UTME ABU 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 9.00, what is the volume of NaOH added?
A. 10.0 mL
B. 20.0 mL
C. 25.0 mL
D. 30.0 mL
Question 2
A 50.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?
A. 10.0 mL
B. 20.0 mL
C. 25.0 mL
D. 30.0 mL
Question 3
The reaction between H2 and O2 is catalyzed by a platinum catalyst. The rate cons\tant (k) for the reaction is 2.5 × 10^-3 s^-1 at 25°C. If the initial concentration of H2 is 0.1 M, calculate the concentration of H2 after 10 minutes.
A. 0.05 M
B. 0.075 M
C. 0.10 M
D. 0.125 M
Question 4
A 2.5 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. If the current is 5.0 A and the electrolysis is carried out for 2.0 hours, calculate the mass of oxygen gas produced at the anode.
A. 0.50 g
B. 1.0 g
C. 1.5 g
D. 2.0 g
Question 5
A solution of 0.1 M HCl is titrated with 0.2 M NaOH. If 25 mL of HCl requires 20 mL of NaOH for neutralization, what is the concentration of HCl?
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 6
A diagram of a titration setup is shown below.
A. The solution in beaker A is acidic.
B. The solution in beaker A is basic.
C. The solution in beaker B is acidic.
D. The solution in beaker B is basic.
Question 7
A 2.5 L sample of CO2 at 25°C and 1 atm is heated to 50°C. Calculate the new volume of CO2, assuming ideal gas behavior.
A. 3.5 L
B. 4.1 L
C. 5.0 L
D. 6.3 L
Question 8
A 2.0 M solution of CH3OH is mixed with a 2.0 M solution of H2O. If the reaction is carried out at 25°C, calculate the equilibrium cons\tant (K) for the reaction.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 9
A solution contains 0.0500 M NaOH and 0.0500 M HCl. What is the pH of the solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 10
Determine the solubility of AgCl in a 0.1 M solution of NaCl at 25°C. The solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^-10.
A. 1.0 × 10^-5 M
B. 1.5 × 10^-5 M
C. 2.0 × 10^-5 M
D. 3.0 × 10^-5 M
Question 11
A solution of HCl is titrated with NaOH. If 25 mL of 2 M HCl requires 35 mL of 1 M NaOH for neutralization, what is the concentration of HCl?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 12
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 9.00, what is the volume of NaOH added?
A. 10.0 mL
B. 20.0 mL
C. 25.0 mL
D. 30.0 mL
Question 13
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. Write the balanced equation for the reaction.
A. Fe2+ + MnO4- → Fe3+ + Mn2+
B. Fe2+ + MnO4- → Fe3+ + MnO2
C. Fe2+ + MnO4- → Fe2+ + Mn2+
D. Fe3+ + MnO4- → Fe2+ + Mn2+
Question 14
A solution contains 0.0500 M NaOH and 0.0500 M HCl. What is the pH of the solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 15
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If the reaction is carried out at 25°C, calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0

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: