POST UTME BELLS UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below.
A. The burette contains the acid.
B. The beaker contains the acid.
C. The burette contains the base.
D. The beaker contains the base.
Question 2
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the resulting pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 3
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the partial pressure of nitrogen gas in the sample.
A. 0.95 atm
B. 0.98 atm
C. 1.02 atm
D. 1.05 atm
Question 4
In a study on the environmental impact of oil spills, a researcher measured the concentration of polycyclic aromatic hydrocarbons (PAHs) in soil samples. The data showed a significant correlation between PAH concentration and soil pH. Which of the following best describes the relationship between PAH concentration and soil pH?
A. PAH concentration increases with increa\sing soil pH
B. PAH concentration decreases with increa\sing soil pH
C. PAH concentration remains cons\tant regardless of soil pH
D. No correlation exists between PAH concentration and soil pH
Question 5
The reaction between sulfuric acid and sodium hydroxide is a classic example of a neutralization reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. H2SO4 + NaOH → Na2SO4 + H2O
B. H2SO4 + NaOH → NaHSO4 + H2O
C. H2SO4 + NaOH → Na2SO4 + H2
D. H2SO4 + NaOH → NaHSO4 + NaOH
Question 6
A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 0.5 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. 50 mL
D. 100 mL
Question 7
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming that the temperature remains cons\tant?
A. 0.5 L
B. 1.0 L
C. 2.0 L
D. 4.0 L
Question 8
A solution of sodium chloride is electrolyzed u\sing a platinum electrode. What is the product at the cathode?
A. Oxygen gas
B. Hydrogen gas
C. Sodium metal
D. Chlorine gas
Question 9
A sample of sulfur dioxide gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the partial pressure of sulfur dioxide gas in the sample.
A. 0.90 atm
B. 0.92 atm
C. 0.95 atm
D. 0.98 atm
Question 10
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. What is the partial pressure of the gas?
A. 0.95 atm
B. 0.99 atm
C. 1.01 atm
D. 1.05 atm
Question 11
A sample of a gas at 25°C and 1 atm is expanded to 0.5 atm. What is the new volume of the gas, assuming that the temperature remains cons\tant?
A. 0.5 L
B. 1.0 L
C. 2.0 L
D. 4.0 L
Question 12
A 1.0 M solution of hydrochloric acid (HCl) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 13
A 0.5 M solution of NaOH is prepared by dissolving 10 g of NaOH in 1000 g of water. What is the volume of the solution in liters?
A. 1.0 L
B. 0.5 L
C. 2.0 L
D. 0.25 L
Question 14
A gas at 25°C and 1 atm is compressed to 4 atm. What is the new volume of the gas?
A. 0.25 L
B. 0.5 L
C. 1.0 L
D. 2.0 L
Question 15
The reaction between hydrogen gas (H2) and chlorine gas (Cl2) produces hydrochloric acid (HCl). Write the balanced chemical equation for this reaction.
A. 2H2 + Cl2 → 2HCl
B. H2 + Cl2 → HCl
C. 2HCl + Cl2 → H2
D. HCl + H2 → Cl2

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