POST UTME AAUA 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. What is the purpose of the burette in the 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 separate the titrant and analyte.
Question 2
A sample of a metal oxide has a mass of 25.0 g and a volume of 5.00 cm³. If the density of the metal oxide is 7.50 g/cm³, what is the number of moles of the metal oxide?
A. 0.333 mol
B. 0.667 mol
C. 1.00 mol
D. 1.33 mol
Question 3
A 1.00 L sample of a gas at 25°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.50
B. 1.00
C. 1.50
D. 2.00
Question 4
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 5
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the concentration of the resulting solution?
A. 1.0 M
B. 1.5 M
C. 2.0 M
D. 2.5 M
Question 6
The reaction of ethanol with potassium dichromate in the presence of sulfuric acid produces acetaldehyde and chromium(III) sulfate. What is the equation for this reaction?
A. C₂H₅OH + K₂Cr₂O₇ → C₂H₄O + Cr₂(SO₄)₃
B. C₂H₅OH + K₂Cr₂O₇ → C₂H₄O + Cr₂(SO₄)₃ + H₂O
C. C₂H₅OH + K₂Cr₂O₇ → C₂H₄O + Cr₂(SO₄)₃ + H₂O + K₂SO₄
D. C₂H₅OH + K₂Cr₂O₇ → C₂H₄O + Cr₂(SO₄)₃ + H₂O + K₂SO₄ + H₂SO₄
Question 7
A 1.00-g sample of a metal hydroxide is dissolved in water to produce 250 mL of a solution containing 0.100 M metal ions. What is the molar mass of the metal hydroxide?
A. 100 g/mol
B. 120 g/mol
C. 140 g/mol
D. 160 g/mol
Question 8
A 1.00 M solution of sodium hydroxide is titrated with 1.00 M hydrochloric acid. What is the pH of the solution after 50.0 mL of hydrochloric acid has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
A sample of a metal has a mass of 10.0 g and a volume of 2.00 cm³. If the density of the metal is 8.00 g/cm³, what is the number of moles of the metal?
A. 0.125 mol
B. 0.250 mol
C. 0.500 mol
D. 1.00 mol
Question 10
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1792.5 kJ/mol
B. -1792.8 kJ/mol
C. -1792.2 kJ/mol
D. -1792.1 kJ/mol
Question 11
The electronegativity of an element is a measure of its ability to attract electrons in a covalent bond. Which of the following elements has the highest electronegativity among the given options?
A. Fluorine (F)
B. Chlorine (Cl)
C. Bromine (Br)
D. Iodine (I)
Question 12
A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of the gas?
A. 0.9 atm
B. 0.95 atm
C. 1.0 atm
D. 1.05 atm
Question 13
A 1.0 M solution of H2SO4 is electrolyzed at a cons\tant current of 5.0 A. What is the mass of H2 produced at the cathode after 2.0 hours?
A. 0.25 g
B. 0.50 g
C. 1.00 g
D. 1.25 g
Question 14
The pH of a solution is 4.25. What is the concentration of hydrogen ions in the solution?
A. 1.0 x 10⁻⁴ M
B. 1.0 x 10⁻³ M
C. 1.0 x 10⁻² M
D. 1.0 x 10⁻¹ M
Question 15
The s\tandard entropy of formation (ΔSf) for CO2(g) is -213.8 J/mol·K. If 2.50 mol of CO2 is produced at 298 K, what is the total entropy change (ΔS) for the reaction?
A. -536.5 J/K
B. -536.0 J/K
C. -535.5 J/K
D. -535.0 J/K

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: