POST UTME ABU 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 2
A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume of the gas?
A. \text{New volume} = \frac{2.5 \text{ L} \times 300 \text{ K}}{273 \text{ K}} \times \frac{1 \text{ L}}{1 \text{ L}}
B. \text{New volume} = \frac{2.5 \text{ L} \times 300 \text{ K}}{273 \text{ K}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}}
C. \text{New volume} = \frac{2.5 \text{ L} \times 300 \text{ K}}{273 \text{ K}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}}
D. \text{New volume} = \frac{2.5 \text{ L} \times 300 \text{ K}}{273 \text{ K}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}} \times \frac{1 \text{ L}}{1 \text{ L}}
Question 3
A 1.0 M solution of sodium hydroxide (NaOH) is titrated with a 2.0 M solution of hydrochloric acid (HCl). If 25 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 4
The following diagram shows a polymer chain. Identify the type of polymer.
A. Polyethylene
B. Polypropylene
C. Polyvinyl Chloride
D. Polyester
Question 5
A solution contains 2.5 g of NaCl. If 10 mL of water is added to the solution, what is the concentration of the solution in g/L?
A. 0.25 g/L
B. 0.5 g/L
C. 1 g/L
D. 2 g/L
Question 6
A 2.5 L sample of a gas at 27°C and 1 atm is collected over water. If the vapor pressure of water at 27°C is 27.3 mmHg, calculate the partial pressure of the gas.
A. 1.2 atm
B. 1.5 atm
C. 1.8 atm
D. 2.1 atm
Question 7
The following equation represents a chemical equilibrium. Write the equilibrium cons\tant expression.
A. K = \\frac{[\\text{CaO}][\\text{CO}_2]}{[\\text{CaCO}_3]}
B. K = \\frac{[\\text{CaCO}_3]}{[\\text{CaO}][\\text{CO}_2]}
C. K = \\frac{[\\text{CaO}]}{[\\text{CaCO}_3][\\text{CO}_2]}
D. K = \\frac{[\\text{CO}_2]}{[\\text{CaO}][\\text{CaCO}_3]}
Question 8
A 50 mL sample of a 0.2 M solution of calcium chloride (CaCl2) is mixed with a 50 mL sample of a 0.1 M solution of sodium hydroxide (NaOH). Calculate the concentration of the resulting solution.
A. 0.05 M
B. 0.07 M
C. 0.09 M
D. 0.11 M
Question 9
The boiling point of a solution containing 10 g of glu\cose (C6H12O6) in 100 g of water is 102.5°C. Calculate the molality of the solution.
A. 0.5 m
B. 0.7 m
C. 0.9 m
D. 1.1 m
Question 10
The following diagram shows a periodic table. Identify the group number of the element with atomic number 12.
A. Group 1
B. Group 2
C. Group 13
D. Group 14
Question 11
A sample of iron (Fe) is heated in air to produce iron(III) oxide (Fe2O3). If 2.5 g of Fe is heated, what is the mass of Fe2O3 produced?
A. 5.0 g
B. 6.25 g
C. 7.5 g
D. 10 g
Question 12
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
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 add the titrant to the analyte
Question 13
The reaction between sulfuric acid and sodium hydroxide is a classic example of a reaction that involves the formation of a new compound. Which of the following is the correct equation for this reaction?
A. \boxed{H_2SO_4 + NaOH \rightarrow H_2O + Na_2SO_4}
B. \boxed{H_2SO_4 + 2NaOH \rightarrow Na_2SO_4 + 2H_2O}
C. \boxed{H_2SO_4 + NaOH \rightarrow H_2O + NaHSO_4}
D. \boxed{H_2SO_4 + 2NaOH \rightarrow 2H_2O + Na_2SO_4}
Question 14
A 1.0 L flask contains 0.2 mol of H2 at 25°C. What is the concentration of H2 in the flask?
A. 0.2 M
B. 0.5 M
C. 1 M
D. 2 M
Question 15
The following diagram shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Conical Flask
D. Pipette

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: