POST UTME UNILAG 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 L flask contains 0.500 mol of a gas at 25°C. What is the pressure of the gas?
A. 1.00 atm
B. 2.00 atm
C. 3.00 atm
D. 4.00 atm
Question 2
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of H+ ions in the solution.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Question 3
A diagram of a chromatography setup is shown below. If the retention time of the solute is 10 minutes, what is the concentration of the solute?
Question 4
The diagram below shows a circuit setup. What is the purpose of the resistor?
A. To reduce the voltage of the circuit
B. To increase the current of the circuit
C. To measure the voltage of the circuit
D. To measure the current of the circuit
Question 5
A diagram of a distillation setup is shown below. If the boiling point of the mixture is 120°C, what is the composition of the mixture?
A. 50% ethanol and 50% water
B. 60% ethanol and 40% water
C. 70% ethanol and 30% water
D. 80% ethanol and 20% water
Question 6
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. The pH of the solution at the equivalence point is 7. What is the pH of the solution at the half-equivalence point?
A. 6.0
B. 6.5
C. 7.0
D. 7.5
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of OH- ions in the solution.
A. 0.1
B. 0.01
C. 0.001
D. 0.0001
Question 8
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 9
In the electrolysis of a molten ionic compound, what is the primary function of the inert electrode?
A. To facilitate the transfer of ions to the electrode
B. To provide a path for the flow of electrons
C. To prevent the reaction from occurring
D. To increase the rate of reaction
Question 10
A sample of a non-metallic oxide, X₂O₃, is found to have a mass of 0.250 g and a volume of 0.500 mL. What is the molar mass of the oxide?
A. 100.0 g/mol
B. 150.0 g/mol
C. 200.0 g/mol
D. 250.0 g/mol
Question 11
A sample of water contains 0.1 g/L of dissolved oxygen. What is the concentration of dissolved oxygen in moles per liter?
A. 1.0 x 10^-3 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-5 M
D. 1.0 x 10^-6 M
Question 12
The reaction of sodium hydroxide with hydrochloric acid produces sodium chloride and water. What is the balanced chemical equation for this reaction?
A. NaOH + HCl → NaCl + H2O
B. NaOH + HCl → NaCl + O2
C. NaOH + HCl → NaCl + CO2
D. NaOH + HCl → NaCl + SO2
Question 13
A 25-mL sample of a 0.1 M solution of NaOH is mixed with 25 mL of a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 14
A sample of a metal oxide is heated in a crucible. What is the expected outcome?
A. The metal oxide decomposes into its constituent elements
B. The metal oxide is reduced to its metal form
C. The metal oxide is oxidized to a higher oxidation state
D. The metal oxide remains unchanged
Question 15
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4

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