POST UTME AAUA 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00-g sample of a polymer is dissolved in 50.0 cm³ of benzene. The solution is then titrated with 0.100 M HCl. The volume of HCl required to precipitate the polymer is 25.0 cm³. Calculate the molar mass of the polymer.
A. 1000 g mol⁻¹
B. 1500 g mol⁻¹
C. 2000 g mol⁻¹
D. 2500 g mol⁻¹
Question 2
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 3
A 25.0 mL sample of 0.100 M HCl is mixed with a 25.0 mL sample of 0.100 M NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 4
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 5
A 2.00-g sample of a metal is electrolyzed in a solution of 0.100 M HCl. The mass of the metal deposited at the cathode is 1.50 g. Calculate the molar mass of the metal.
A. 1000 g mol⁻¹
B. 1500 g mol⁻¹
C. 2000 g mol⁻¹
D. 2500 g mol⁻¹
Question 6
A 1.0 M solution of ammonia (NH3) is mixed with a 2.0 M solution of hydrochloric acid (HCl). Calculate the number of moles of NH3 that react with HCl in a 1:1 mole ratio.
A. 0.5 mol
B. 1.0 mol
C. 1.5 mol
D. 2.0 mol
Question 7
The reaction of ammonia with oxygen gas is represented by the equation: 4NH3 + 5O2 → 4NO + 6H2O. If 1.00 L of ammonia 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. Ammonia gas
B. Oxygen gas
C. Nitric oxide
D. Water
Question 8
A 10 mL sample of a solution containing 0.1 M NaCl is mixed with 20 mL of a solution containing 0.2 M KCl. What is the concentration of Cl- ions in the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 9
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 10
A 2.00-g sample of a non-metallic oxide of sulfur is decomposed by heating with graphite in a stream of hydrogen at 1273 K. The volume of hydrogen gas produced at STP is 1.25 dm³. Calculate the empirical formula of the oxide.
A. SO
B. SO₂
C. SO₃
D. SO₄
Question 11
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
Question 12
A gas at 300 K has a pressure of 1.2 atm. If the temperature is increased to 400 K, what is the new pressure?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 13
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 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
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

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