POST UTME VERITAS UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The boiling point of aniline is higher than that of benzene due to the presence of a hydrogen bond between the molecules. What is the type of intermolecular force responsible for this phenomenon?
A. hydrogen bonding
B. dipole-dipole interaction
C. London dispersion forces
D. ionic interaction
Question 2
The atomic structure of an atom consists of a nucleus surrounded by electrons. Which of the following types of radiation is emitted when an electron falls from a higher energy level to a lower energy level?
A. Alpha radiation
B. Beta radiation
C. Gamma radiation
D. X-ray radiation
Question 3
The polymerization of styrene to polystyrene is an example of a chain reaction. Which of the following is the primary mechanism of termination in this reaction?
A. Combination of two growing polymer chains
B. Transfer of a growing polymer chain to a monomer
C. Termination by a free radical scavenger
D. Termination by a chain transfer agent
Question 4
A sample of 2.0 g of a metal hydroxide is dissolved in water to form a solution of 0.1 M OH- ions. If the volume of the solution is 1.0 L, what is the concentration of the metal ions in the solution?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 5
A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then diluted to a total volume of 100 mL. If the polymer has a molar mass of 50000 g/mol, what is the concentration of the polymer in the solution in units of g/L?
A. 25 g/L
B. 50 g/L
C. 100 g/L
D. 200 g/L
Question 6
The diagram below shows a titration setup. Identify the part labeled A.
A. A burette
B. A beaker
C. A pipette
D. A measuring cylinder
Question 7
A 2.50 g sample of a compound containing only carbon and hydrogen is found to have a mass of 1.25 g of carbon. What is the empirical formula of the compound?
A. CH2
B. C2H4
C. C3H6
D. C4H8
Question 8
A diagram of a titration setup is shown below. If the burette contains 0.100 M NaOH and the flask contains 25.0 mL of 0.100 M HCl, what is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
A metal oxide, M2O3, is reduced to form a metal, M. If the reduction reaction is as follows: M2O3 + 3C → 2M + 3CO, what is the mass of carbon required to reduce 2.5 g of M2O3?
A. 1.5 g
B. 2.0 g
C. 2.5 g
D. 3.0 g
Question 10
A solution of NaCl is electrolyzed u\sing a current of 2.00 A for 5.00 hours. Calculate the mass of chlorine gas produced at the anode.
A. 0.050 g
B. 0.100 g
C. 0.150 g
D. 0.200 g
Question 11
A sample of 2.5 g of a metal carbonate is heated to produce a metal oxide. If the mass of the metal oxide is 2.0 g, what is the percentage yield of the reaction?
A. 50%
B. 60%
C. 70%
D. 80%
Question 12
The reaction of hydrogen peroxide with potassium iodide to form potassium iodate and water is an example of a decomposition reaction. What is the balanced chemical equation for this reaction?
A. H2O2 + 2KI → KIO3 + 2H2O
B. H2O2 + 2KI → KI + 2H2O
C. H2O2 + 2KI → KIO3 + 2H2O2
D. H2O2 + 2KI → KI + 2H2O2
Question 13
A sample of a non-metallic oxide is heated strongly. The resulting gas is collected over water and found to have a volume of 2.50 dm3 at 20°C and 1.00 atm. Calculate the number of moles of the gas produced.
A. 0.010 mol
B. 0.020 mol
C. 0.030 mol
D. 0.040 mol
Question 14
A solution of 0.100 M HCl is mixed with a solution of 0.100 M NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 15
A diagram of a titration setup is shown below. If the burette contains 0.100 M NaOH and the flask contains 50.0 mL of 0.100 M HCl, what is the pH of the solution after the addition of 30.0 mL of NaOH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

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