POST UTME BSU 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of hydrogen gas (H2) is collected over water at a temperature of 298 K and a pressure of 1.00 atm. If the partial pressure of water vapor is 0.50 atm, what is the partial pressure of hydrogen gas?
A. 0.50 atm
B. 0.75 atm
C. 1.00 atm
D. 1.25 atm
Question 2
A 1.00 L solution of 0.100 M NaCl is electrolyzed u\sing a current of 2.50 A. Calculate the mass of Cl2 gas produced at the anode.
A. 0.250 g
B. 0.500 g
C. 1.00 g
D. 2.00 g
Question 3
A polymer (P) has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 4
A solution of acetic acid is prepared by dissolving 10.0 g of acetic acid in 100 mL of water. What is the pH of the solution?
A. 2.0
B. 2.5
C. 3.0
D. 3.5
Question 5
A solution of 0.10 M glu\cose (C6H12O6) is titrated with 0.20 M sodium hydroxide (NaOH). If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the glu\cose?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 6
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. Write the balanced equation for this reaction.
A. Fe2+ + MnO4- → Fe3+ + Mn2+
B. Fe2+ + MnO4- → Fe3+ + MnO2
C. Fe2+ + MnO4- → Fe2+ + Mn2+
D. Fe3+ + MnO4- → Fe2+ + Mn2+
Question 7
A solution of 0.10 M acetic acid (CH3COOH) is titrated with 0.20 M sodium hydroxide (NaOH). If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the acetic acid?
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 8
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. Calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
The s\tandard Gibbs free energy change for the reaction: 2Fe(s) + O2(g) → 2FeO(s) is -400 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.
A. 1.00 × 10^10
B. 1.00 × 10^20
C. 1.00 × 10^30
D. 1.00 × 10^40
Question 10
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.
A. 200 g/mol
B. 500 g/mol
C. 1000 g/mol
D. 2000 g/mol
Question 11
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. Assume that the polymer has a molecular formula of \( CH2=CH-CH3 \)n.
A. 120 g/mol
B. 180 g/mol
C. 240 g/mol
D. 300 g/mol
Question 12
A metal with an atomic number of 24 is heated in a crucible. The resulting metal has an atomic number of 22. What is the name of the metal that was heated?
A. Chromium
B. Manganese
C. Iron
D. Copper
Question 13
A 25 mL sample of a polymer solution contains 0.5 g of polymer. If the density of the polymer is 1.2 g/mL, what is the concentration of the polymer solution in g/mL?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 14
A gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas if the initial volume is 2 L?
A. 1
B. 2
C. 4
D. 8
Question 15
A polymer (P) has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol

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