POST UTME NOUN 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, what is the partial pressure of CO2?
A. 0.5 atm
B. 0.6 atm
C. 0.7 atm
D. 0.8 atm
Question 2
A 25 mL sample of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 25 mL
D. 50 mL
Question 3
The reaction between sulfuric acid and sodium hydroxide is a type of reaction. What is the name of this reaction?
A. Neutralization reaction
B. Oxidation-reduction reaction
C. Acid-base reaction
D. Combustion reaction
Question 4
A 100 mL sample of 0.5 M H2SO4 is mixed with a 100 mL sample of 0.5 M NaOH. Calculate the pH of the resulting solution.
A. 1
B. 2
C. 1
D. 2
Question 5
A sample of hydrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the volume of the hydrogen gas at s\tandard temperature and pressure (STP)?
A. 22.4 L
B. 44.8 L
C. 67.2 L
D. 89.6 L
Question 6
A 1.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is the pH of the solution?
A. 0.5
B. 1.0
C. 2.0
D. 3.0
Question 7
The rate of a chemical reaction is affected by the concentration of the reac\tants. What is the term for the increase in the rate of reaction with an increase in the concentration of the reac\tants?
A. Catalysis
B. Activation energy
C. Order of reaction
D. Rate cons\tant
Question 8
A diagram of a circuit is shown below. What is the purpose of the resistor?
A. To reduce the voltage
B. To increase the current
C. To regulate the flow of electrons
D. To generate electricity
Question 9
A diagram of a titration setup is shown below. 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 10
A solution of potassium permanganate (KMnO4) is added to a solution of oxalic acid (H2C2O4). The reaction is represented by the equation: 2KMnO4(aq) + 5H2C2O4(aq) + 3H2SO4(aq) → K2SO4(aq) + 2MnSO4(aq) + 10CO2(g) + 8H2O(l). What is the number of moles of oxalic acid required to react with 2 moles of potassium permanganate?
A. 2 moles
B. 3 moles
C. 4 moles
D. 5 moles
Question 11
The atomic radius of an element increases down a group in the periodic table due to the addition of new energy levels. However, the atomic radius of an element decreases across a period due to the increase in effective nuclear charge. Which of the following elements has the largest atomic radius?
A. Francium (Fr)
B. Caesium (Cs)
C. Rubidium (Rb)
D. Potassium (K)
Question 12
A sample of air contains 21% oxygen, 78% nitrogen, and 1% other gases. What is the partial pressure of oxygen in a sample of air at 1 atm total pressure?
A. 0.21 atm
B. 0.21 kPa
C. 0.21 bar
D. 0.21 MPa
Question 13
A solution of sodium hydroxide (NaOH) is mixed with a solution of acetic acid (CH3COOH). The reaction is represented by the equation: NaOH(aq) + CH3COOH(aq) → CH3COONa(aq) + H2O(l). What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 14
The s\tandard enthalpy of formation (ΔHf) of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation (ΔHf) of CO(g)?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -247.4 kJ/mol
Question 15
The reaction of zinc metal with hydrochloric acid is represented by the equation: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g). What is the oxidation state of zinc in this reaction?
A. 0
B. +2
C. -2
D. +1

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