POST UTME DELSU 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 2.5 M
B. 2.0 M
C. 1.0 M
D. 0.5 M
Question 2
A 1.5 M solution of NaOH is prepared by dissolving 37.5 g of NaOH in 1 L of water. Calculate the number of moles of NaOH dissolved in the solution.
A. 0.75 mol
B. 1.5 mol
C. 2.25 mol
D. 3 mol
Question 3
A 0.1 M solution of NaOH is prepared by dissolving 6.0 g of NaOH in 1000 mL of water. Calculate the molarity of the solution after 10 mL of 1.0 M HCl has been added.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 4
The diagram below represents 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 filter the solution
Question 5
The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product NO?
A. +1
B. +2
C. +3
D. +4
Question 6
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) + 1/2 O2(g) → H2O(l).
A. -285.8 kJ/mol
B. -285.8 kJ/mol + 0 kJ/mol
C. -285.8 kJ/mol - 0 kJ/mol
D. -285.8 kJ/mol + 0 kJ/mol - 0 kJ/mol
Question 7
The diagram below shows a setup for a chromatography experiment.
A. Separation of a mixture of two subs\tances
B. Separation of a mixture of three subs\tances
C. Separation of a mixture of four subs\tances
D. Separation of a \single subs\tance
Question 8
A 0.5 M solution of NaOH is prepared by dissolving 25 g of NaOH in 1 L of water. Calculate the number of moles of NaOH dissolved in the solution.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1 mol
Question 9
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 10
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.2 L
B. 3.5 L
C. 4.0 L
D. 4.5 L
Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) + O2(g) → CO2(g).
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol - 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol - 0 kJ/mol
Question 12
A metal M reacts with oxygen gas to form a compound with the formula MO. The molar mass of the compound is 80.0 g/mol. What is the identity of the metal M?
A. Ca
B. Mg
C. Al
D. Si
Question 13
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas when its volume is increased to 5.0 L at 298 K?
A. 0.75 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 14
The reaction of sulfur dioxide with oxygen is represented by the equation: 2SO2 + O2 → 2SO3. What is the oxidation state of sulfur in the product SO3?
A. +2
B. +4
C. +6
D. +8
Question 15
A sample of a polymer has a molecular weight of 50,000 g/mol. If 1.0 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.5 g/L
B. 1.0 g/L
C. 2.0 g/L
D. 5.0 g/L

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