POST UTME AAUA 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.100 M NaCl is prepared by dissolving 10.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 10.0 g/L
B. 20.0 g/L
C. 30.0 g/L
D. 40.0 g/L
Question 2
A solution contains 0.100 M HCl and 0.200 M NaOH. What is the concentration of Cl- ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 3
A solution contains 0.100 M NaOH and 0.200 M HCl. What is the concentration of Na+ ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 4
The s\tandard Gibbs free energy change (ΔG°) for the reaction 2NO(g) + O2(g) → 2NO2(g) is -110.5 kJ/mol. Calculate the equilibrium cons\tant (K) at 298 K.
A. 1.2 × 10^10
B. 1.2 × 10^5
C. 1.2 × 10^2
D. 1.2 × 10^-2
Question 5
The reaction of hydrogen gas with oxygen gas is represented by the equation: 2H2 + O2 → 2H2O. If 1.00 L of hydrogen gas at 25°C and 1.00 atm is mixed with 1.00 L of oxygen gas at 25°C and 1.00 atm, what is the limiting reac\tant?
A. Hydrogen gas
B. Oxygen gas
C. Water
D. None of the above
Question 6
A 2.0 M solution of acetic acid (CH3COOH) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). Calculate the number of moles of CH3COOH that react with NaOH in a 1:1 mole ratio.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 7
A sample of a gas at 25°C and 1.00 atm is found to have a volume of 2.50 L. What is the number of moles of gas present?
A. 0.0100
B. 0.100
C. 1.00
D. 10.0
Question 8
The reaction of hydrogen gas with oxygen gas is represented by the equation: 2H2 + O2 → 2H2O. If 1.00 L of hydrogen gas at 25°C and 1.00 atm is mixed with 1.00 L of oxygen gas at 25°C and 1.00 atm, what is the limiting reac\tant?
A. Hydrogen gas
B. Oxygen gas
C. Water
D. None of the above
Question 9
What is the molar solubility of CaF2 in a 0.100 M solution of NaF?
A. 0.0100
B. 0.100
C. 1.00
D. 10.0
Question 10
A solution contains 0.100 M NaCl and 0.200 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 11
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 12
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, how much of the subs\tance will remain after 10 years?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
Question 13
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 14
A 2.0 M solution of acetic acid (CH3COOH) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). Calculate the pH of the resulting solution.
A. 2.5
B. 3.5
C. 4.5
D. 5.5
Question 15
What is the major product of the reaction between 2-methyl-2-propanol and HCl?
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropan-2-ol
C. 2-methyl-2-propanol
D. 2-methyl-2-propanone

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