POST UTME UNIOSUN 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The volume of CO2 produced is 1.20 L at 25°C and 1 atm. The volume of H2O produced is 0.50 L at 25°C and 1 atm. Calculate the empirical formula of the compound.
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 2
A 5.0 g sample of a metal hydroxide is dissolved in 50 mL of water to produce a solution containing 0.1 M OH- ions. Calculate the molar concentration of the metal ions in the solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 3
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide produced is 1.5 g. Calculate the percentage yield of the metal oxide.
A. 75%
B. 80%
C. 85%
D. 90%
Question 4
A 2.50 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The volume of CO2 produced is 1.20 L at 25°C and 1 atm. The volume of H2O produced is 0.50 L at 25°C and 1 atm. Calculate the empirical formula of the compound.
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 5
A solution contains 5.00 g of NaCl in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.50 M
B. 1.00 M
C. 2.00 M
D. 3.00 M
Question 6
A gas is collected over water in a gas syringe. Which of the following is a correct interpretation of the data?
A. The volume of the gas is directly proportional to the temperature.
B. The volume of the gas is inversely proportional to the temperature.
C. The volume of the gas is directly proportional to the pressure.
D. The volume of the gas is inversely proportional to the pressure.
Question 7
A solution contains 5.00 g of NaCl in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.50 M
B. 1.00 M
C. 2.00 M
D. 3.00 M
Question 8
A 5.0 g sample of a metal hydroxide is dissolved in 50 mL of water to produce a solution containing 0.1 M OH- ions. Calculate the molar concentration of the metal ions in the solution.
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 9
A 0.1 M solution of sodium sulfate (Na2SO4) is prepared by dissolving 2.5 g of the salt in 100 mL of water. Calculate the molarity of the solution.
A. 0.025 M
B. 0.05 M
C. 0.1 M
D. 0.2 M
Question 10
A solution of a non-metallic oxide is prepared by dissolving the oxide in water. Which of the following is a correct interpretation of the data?
A. The solution is acidic.
B. The solution is basic.
C. The solution is neutral.
D. The solution is a salt.
Question 11
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
Question 12
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mole of methane (CH4(g)) u\sing the following equation: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l).
A. -890.3 kJ/mol
B. -890.4 kJ/mol
C. -890.5 kJ/mol
D. -890.6 kJ/mol
Question 14
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 5 mL
B. 10 mL
C. 15 mL
D. 20 mL
Question 15
A solution contains 5.00 g of NaCl in 100.0 mL of water. Calculate the molarity of the solution.
A. 0.50 M
B. 1.00 M
C. 2.00 M
D. 3.00 M

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